Gluten Relief + Floracor-GI + FREE Digest-GI

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Ultimate Metabolic Formula + Floracor-GI + FREE Digest-GI

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Circulation and Heart Health | Serracor-NK | Serrapeptase

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Excellacor & Serrapeptase 80,000 SU

Muscular Skeletal Health | Excellacor | Serrapeptase

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Vida-Defense + Floracor-GI + FREE Digest-GI

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Excellacor + Floracor-GI + FREE Digest-GI

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Lacto-Relief + Floracor-GI + FREE Digest-GI

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Excellacor 90 capsules

Excellacor vs. Vitalzym

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Intestinal and Digestive Health | Floracor-GI

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Lacto Relief


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Lipase-HP Plus

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Respiratory Health | Serracor-NK | Serrapeptase | Lung Support

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Ultimate Metabolic Formula

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Gluten Relief

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Serracor-NK + Floracor-GI + FREE Digest-GI

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Serracor-NK vs. Neprinol

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Rated 4.95 out of 5 based on 41 customer ratings
(41 customer reviews)

Systemic Enzyme Formula Supports:

  • Normal Respiratory Health*
  • support circulatory health
  • Immune health*

150 Capsules:   $84.99 Now   $74.99
300 Capsules: $164.99 Now $124.99



Serracor-NK -Systemic Enzyme Blend

Understanding Fibrin & Systemic Enzymes

Fibrin is an insoluble protein the body produces in response to injury or trauma. It is the body’s natural response to recovery.  Fibrin performs important functions in the body.  Although fibrin has many functions, the most important include clotting and wound healing. One of the first steps to wound healing is the process of blood clotting.  The protein precursor fibrinogen is converted into fibrin, which forms a layer of connective tissue inside the damaged blood vessel.  This is a normal process.  To do this, the fibrin strands assemble into a net-like structure over the damaged vessel and harden, forming a “patch” or small clot to prevent further damage.  While fibrin is meant to work as a protective function, too much fibrin build up can cause problems such as:

  • A high level of circulating fibrin in the blood has the potential to accelerate scarring
  • Impede normal circulation
  • more serious fibrotic conditions or cardiovascular conditions

The human body produces enzymes responsible to support all biological reactions within the body. The different systems in our bodies including our cardiovascular, digestive, and immune systems, would not be able to function without the support of these proteolytic enzymes. Enzymes carry out chemical reactions necessary for simple everyday functions such as our metabolism, breathing, and even our heart rate. It is important for us to supplement with necessary enzymes when our bodies fail to supply adequately.

As we age, our bodies gradually become unable to meet the daily demand of producing enzymes. When this occurs, it is imperative for us to begin to supplement our body with the necessary enzymes to prevent havoc within. With the use of proteolytic systemic enzymes, they can increase the support of many conditions including:

  • cardiovascular and respiratory health*
  • the breakdown of excess fibrin*
  • promote faster recovery *
  • immune system regulation*
  • healthy blood sugar levels*

Serracor-NK for Circulatory Support*

Serracor-NK is a powerful blend of antioxidant herbs, CoEnzyme q10 and magnesium with enteric-coated serrapeptase and nattokinase.  These two systemic enzymes have been studied for their fibrinolytic properties. This complete array of proteolytic enzymes, herbs, and minerals supports healthy circulatory and respiratory systems and normal fibrin metabolism.*

Enteric-coated serrapeptase and nattokinase, make Serracor-NK a unique blend. Most serrapeptase brands on the market are not enteric coated, which means they can lose a significant portion of their fibrinolytic activity and effectiveness in the acidic environment of the stomach. The enteric coating of our blend allows these sensitive enzymes to survive the acidic conditions of the stomach, thus allowing them to pass into the circulatory system maintaining high activity levels.

Enteric Coated Serrapeptase and Nattokinase

All enzymes have a pH range.  At the extremes of this range, whether acid or alkaline, systemic enzymes will denature (become irreversibly inactive). While it is true that most fungal and plant source systemic enzymes exhibit a fairly broad pH range, some bacterial sourced systemic enzymes are less tolerant of low pH. Because we are the actual manufacturer of our enzymes, we test them for both pH and temperature stability.  Based on the results of these kinetic studies, we have repeatedly demonstrated that serrapeptase and nattokinase are much less tolerant of a low pH and will begin to lose activity in acidic conditions consistent with the stomach.  Therefore, for maximum effectiveness, serrapeptase and nattokinase are best when enterically coated.

When we design a systemic enzyme blend for human consumption, we have to ensure that it will tolerate the pH variables of our gastrointestinal system. We have successfully done this with our systemic enzyme products, including enteric coated serrapeptase and nattokinase.  As a result of our experience and expertise, our entire line of enteric-coated enzymes are able to reach the small intestine with higher activity for full systemic enzyme therapy.

Key Ingredients in Serracor-NK

  • Enteric-Coated Serrapeptase: known to support the body in fibrinolytic breakdown.*
  • Nattokinase: A powerful fibrinolytic agent, known to support circulatory health.*
  • Bromelain: Proteolytic enzyme found in the pineapple plant; known for immune support.*
  • Papain: Derived from papaya, supports the body’s natural immune response.*
  • Lipase: Supports the break-down of fats into essential fatty acids that are needed for healthy circulation.*
  • Rutin: Bioflavonoid that provides antioxidant support.*
  • Amla: Natural source of Vitamin C, supports regulatory immune response.*
  • CoQ10: An essential enzyme and cofactor in metabolism.*
  • Magnesium: An essential mineral used as a cofactor; support cardiovascular and nerve health.*

Serracor-NK supports fibrin levels in the circulatory system.*  In addition, the entire systemic enzyme blend is manufactured in a ISO 9001:2000 and GMP certified facility.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

SKU: N/A Category:

Serracor Supplement Facts









Take on an empty stomach (30-60 minutes before or 2 hours after meals).

Day 1-5:   Take 1 capsule, 3 times a day.

Day 6-11: Take 2 capsule, 3 times a day.

Day 12+:  Therapeutic Dose 3 capsules, 3 times a day.
Therapeutic Dose: Maximum capsules needed for desired effect.

Maintenance Dose: This is the minimum dose needed to continue to maintain the effects of managing your symptoms. This dosage varies upon individual and should be monitored closely.

Caution If you are pregnant, nursing, taking any medication or under medical supervision, consult your doctor before use. Discontinue use and consult your doctor if any adverse reactions occur.

Serracor NK vs Neprinol**


Enteric coated Serrapeptase and Nattokinase

Enzyme Stabilizer BPPS®

Enzyme Manufacturing Source


Neprinol (2004-2008)





Neprinol   (Current)



Japan *









AST Enzymes recently learned of false claims, misstatements and misrepresentations by one of our competitors. These claims call into question the business practices of Specialty Enzymes and Biotechnologies and the quality of Serracor-NK.

Specialty Enzymes & Biotechnologies (SEB) is a major international manufacturer of enzymes for more than 20 industries, including the nutraceutical industry. Vic Rathi, president and founder of SEB, formulated the original Neprinol® for Arthur Andrew Medical (AAM), an enzyme marketing company. The proprietary formula remains the intellectual property of SEB; AAM was not privy to the formula.

SEBkinase® is a blend of enteric-coated nattokinase and serrapeptase, which was first introduced in commerce by SEB in 2002. Two years later, in 2004, SEB was contracted to formulate and make finished products, not raw material, for AAM and SEBkinase became an integral part of the original formula of Neprinol until 2008. During the duration of this contract:

  • SEB received no complaints, verbal or in writing, at any point about the quality and efficacy of Neprinol.
  • SEB did not provide any Neprinol product to AAM in 2009, so any complaints or refunds made thereafter were not for its products. A major distributor who worked with AAM at the time says they did not receive any complaints nor requests for refunds, and there was no apology issued to customers.
  • A review of the batches of Neprinol sold during that time shows activity levels were in accordance with AAM’s requests. In addition, the weight of the powder inside the capsules was within the accepted range of label claims and GMP Standards.
  • Initial production and sale of Serracor-NK was the result of feedback from previous Neprinol customers who contacted SEB as the manufacturer, requesting the original SEBkinase formula.

The quality of SEB products and services are evident in the fact that it has been in business for more than 50 years and continues to experience tremendous growth. In fact, in 2010 SEB expanded its manufacturing facilities, adding a new 25,000 square foot building to meet growing manufacturing demands. Thousands of satisfied customers can attest to the quality and efficacy of our products, and the integrity of our business practices.

Specialty Enzymes and Biotechnologies is an innovator; creating and manufacturing several of the best-selling enzyme supplements on the market today.

Please feel free to call us with questions.

Serracor-NK SEBkinase Formula Remains Unchanged

Specialty Enzymes did not change the formula for SEBkinase or the original formula for Neprinol, which is now available from AST Enzymes as Serracor-NK. Claims that we allegedly lowered the activity of SEBkinase in the original Neprinol formula are untrue. Our SEBkinase blend is unchanged since its introduction. The SEBkinase in Serracor-NK is the same as the SEBkinase in the original formulation of Neprinol. Nothing has changed but the name.

Enteric Coated Serrapeptase and Nattokinase

All enzymes have a pH range.  At the extremes of this range, whether acid or alkaline, systemic enzymes will denature (become irreversibly inactive). While it is true that most fungal and plant source systemic enzymes exhibit a fairly broad pH range, some bacterial sourced systemic enzymes are less tolerant of low pH. Because we are the actual manufacturer of our enzymes, we test them for both pH and temperature stability.  Based on the results of these kinetic studies, we have repeatedly demonstrated that serrapeptase and nattokinase are much less tolerant of a low pH and will begin to lose activity in acidic conditions consistent with the stomach.  Therefore, for maximum effectiveness, serrapeptase and nattokinase are best when enterically coated.

When we design a systemic enzyme blend for human consumption, we have to ensure that it will tolerate the pH variables of our gastrointestinal system. We have successfully done this with our systemic enzyme products, including Peptizyme SP (enteric coated serrapeptase), NattoSEB (enteric coated nattokinase) and SEBKinase (a blend of Peptizyme and NattoSEB).  As a result of our experience and expertise, our entire line of enteric-coated enzymes are able to reach the small intestine with higher activity for full systemic enzyme therapy.

Make an Informed Choice

There are several systemic enzyme products on the market today. In this case, there are two alternatives: an enzyme product from an expert manufacturer or one from a marketing company. You deserve the highest quality and most effective enzyme products available. We encourage you to make an informed choice.


Enteric Coating Comparison

Methacrylic Acid Copolymer


Cellulose Acetate Phthalate (CAP)

Hydroxypropyl Methylcellulose Phthalate (HPMCP)

Acid Armor®
(extra-thick cellulose layer)**

Contains Phthalates





Considered Enteric Coating





Studies supporting Efficacy as Enteric Coating















Time in Use

>50 years

>70 years

~40 years

~1 year

*AST Enzymes uses MAAC as enteric coating


What is enteric coating, and why is it needed?

Enteric coating is a layer of protective coating for dietary supplements that is meant to allow the supplement to bypass digestion by the stomach and be absorbed in the small intestine. Systemic enzymes are proteins, so their functional structures are denatured (or destroyed) in conditions of extreme pH and temperature. Without enteric coating, enzymes would be rendered useless long before they reach the bloodstream, where their carry out their beneficial effects.

What’s enteric coating made of?

At AST Enzymes, we use Methacrylic Acid Copolymer (MAAC) for our enteric coating. Methacrylic Acid Copolymer (MAAC) is not a phthalate. According to independent studies, MAAC is the most gastro-resistant when compared to other commonly used enteric coating agents such as Cellulose Acetate Phthalate (CAP) and Hydroxypropyl Methycellulose Phthalate (HPMCP). This means that MAAC can most effectively withstand the acidity of the stomach, allowing its contents to be released in the small intestine and absorbed successfully.

Don’t let the name scare you. MAAC is a food-grade compound that has been in use as enteric coating in the pharmaceutical industry for over 50 years with no reported side effects. In fact, the European Food Safety Authority – an organization that conducted studies which led to the ban of 6 types of phthalates in personal care products in Europe in 2004 – has deemed MAAC safe for use as coating agent in food supplements.

Not only is MAAC listed as Generally Recognized As Safe (GRAS) by the Food and Drug Administration (FDA), the Environmental Protection Agency (EPA) also conducted various studies and found sufficient information to reasonably conclude that the current use pattern of MAAC will not adversely affect public health or the environment.

** Neprinol® and Acid Armor® are registered trademarks of Arthur Andrews Medical Inc., which is not affiliated with, nor sponsors or endorses this product or any other product from Specialty Enzymes & Biotechnologies or AST Enzymes.


What is systemic enzyme therapy?

Systemic enzyme therapy refers to the therapeutic use of natural enzymes to produce a desired effect. Systemic enzymes are absorbed from the small intestine where they enter the bloodstream and execute their effects on the entire body as a system.


What is a systemic proteolytic enzyme?

Proteolytic enzymes break down proteins into their building-blocks, which are called amino acids. Systemic proteolytic enzymes are responsible for breaking down accumulated protein and waste substances found in the circulatory system and connective tissue.  Regular systemic proteolytic enzyme use can promote circulation and support flushing out these waste products.


 What is fibrin?

Fibrin is a protein-based substance that is needed to help clot one’s blood, playing a substantial role in immune response and healing. When the body responds to injury or chronic inflammation, fibrin is recruited to the damaged area to form scar tissue. Although the body is equipped with plasmin, a naturally occurring enzyme responsible for breaking down excess fibrin, some people are at a disadvantage – as aging occurs, plasmin levels progressively decrease.


Why is it important to take Serracor-NK on an empty stomach?Since most absorption occurs in the small intestine, the systemic enzymes must bypass the stomach to gain access there. If the enzymes are taken with food, they will likely begin working to break down your food within the stomach, rather than passing through to the small intestine. Taking systemic enzymes like Serracor-NK with food will compromise their absorption, as well as their effectiveness.


Does Serracor-NK have an enteric coating?

Yes, the serrapeptase and nattokinase in Serracor-NK are enterically coated. While similar systemic enzymes may have the same active ingredients, most do not utilize enteric coating. The purpose of enteric coating is to protect the enzyme from the acidic environment of the stomach. High activity level is preserved until the enzymes reach the small intestine, where absorption into the bloodstream takes place. While the enteric coating can withstand the acidic environment of the stomach, the alkaline environment of the small intestine will disintegrate the enteric coating, allowing the enzyme to become active within the bloodstream.


Do you use phthalates in your enteric coating?

No, our enteric coating does not use or contain phthalates. At AST Enzymes, we use Methacrylic Acid Copolymer (MAAC) for our enteric coating. Compared to other commonly used enteric coating agents such as Cellulose Acetate Phthalate (CAP) and Hydroxypropyl Methycellulose Phthalate (HPMCP), MAAC is the most gastro-resistant and does not carry the same risks. Additionally, MAAC is considered GRAS (Generally Recognized as Safe) by the FDA and is approved for use by the European Food Safety Authority.To learn more about enteric coating used in AST Enzymes products, please click the “Compare” tab.


How long should I take Serracor-NK before feeling results?

Since people experience varying ailments and severity of disease, the length of time to include systemic enzymes in your regimen may vary as well. As an overall guideline, it is typically recommended that new systemic enzyme users start off slow. A starter dose is generally one capsule, three times daily. After three to four days of proven tolerance, the dose can be increased to a therapeutic dose of 3 capsules, 3 times per day. At this point, results may be monitored, and dosage should be adjusted accordingly. Some consumers find their therapeutic dose between 9-12 capsules per day, while others only need 3-6. There are several factors that may affect results and required dosage, including:




Severity of symptoms


Time of administration (Better absorbed on an empty stomach)

Adherence to regimen

Nutritional state


What if I miss a dose?

Regular, consistent use of systemic enzymes will provide the best results, however missed doses of systemic enzymes do not have serious repercussions. Although symptoms alleviated by systemic enzyme therapy may resurface, getting back on track by remembering to take your next dose will suffice. There is also the option of incorporating another dose during the day. There is no need to “double up,” on one dose – and remember, systemic enzymes are best absorbed on an empty stomach.


Does Serracor-NK have any side effects?

The use of Serracor-NK has not been shown to exhibit detrimental effects, neither long term nor short term. Just as dosage requirements vary, side effects may vary as well. Although gastrointestinal disturbances have been reported by a small percentage of new users, tolerance is maintained once the dosage is adjusted. Minor allergic reactions, like reddening of the skin, are also rare occurrences, and can be seen with extremely high doses. There are no known interactions with prescription or over the counter drugs while using systemic enzyme therapy. However, it is recommended that you consult with your physician about starting systemic enzymes, especially if you are currently on blood-thinning medications or if you are pregnant or nursing.


Can I take Serracor-NK with other systemic enzymes?

Systemic enzymes may be taken together, yielding desirable results, as long as they are taken on an empty stomach. In fact, it is often recommended that systemic enzymes be combined. Products like Serracor-NK and Peptizyme-SP often have synergistic effects when taken together. This means that the separate products work together to produce advantageous results. By combining and enhancing the activity of the enzymes, their effects on the healing process are more attainable.


Can I take Serracor-NK with digestive enzymes?

Although digestive and systemic enzymes are not contraindicated in terms of ingredients, they cannot be taken at the same time. The purpose of digestive enzymes is to aid in digestion of specific foods, so taking them with food is an obvious recommendation. Because systemic enzymes require an empty stomach for maximum absorption, they must be taken separately from digestive enzymes. There are no adverse interactions between systemic and digestive enzymes, but they serve different purposes and thus should be taken as directed for best results.

Based on 41 reviews

5.0 overall

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  1. Rated 5 out of 5

    Sandra Oster

    I had been taking 6-9 serracore-NK per day–I fell down four metal steps, and received several gashes. In addition I weigh 250 pounds. I usually see a chiropractor on a regular basis–with this product I experienced very little joint pain and healed quickly, and didn’t end up in the chiropractors office. this is a 5 Star product for inflammation and pain.

  2. Rated 5 out of 5


    I am a 67 years old male and started taking Serracor in 2012…. I take Serracor mainly for cardiovascular support as well as sinus & old spinal injury inflammation issues… I am single and my diet and exercise habits are OK but not that great…I also take a few other supplements (fish oil/nascent Iodine)…Despite my poor habits I lost 15 lbs to 180 lbs this year and have lowered my blood pressure 20, points to an average 120/72 in 2016….

  3. Rated 5 out of 5

    Pam Shouldice

    My husband has been taking Serracor-NK for about four – five years now. He has chronic exacerbated COPD with emphysema. He says the Serracor works really well to reduce inflammation and to keep his lungs clear. At this point he needs all the help he can get and we’re truly grateful to have found such a wonderful product! Thank you!

  4. Rated 5 out of 5

    Vistara Parham

    After years of chronic intestinal problems,inflammation, discomfort, a friend recommended Serracor NK. Definite, undeniable improvement! Now I take it e every day, and get great relief.

  5. Rated 5 out of 5

    Lina bannister

    I absolutely Serracor nk -I luv this product n this co -they r both very reputable n customer friendly-this product has been a great all around addition to my nutritional protocol -it has been a great blessing for circulation -sinus issues-energy-n just all around feelin better-I highly recommend this product-it it is one of my must haves for sure-I’ve been using this product for several yrs. It has been a great blessing to my overall well being-I thank god for this product n this company-gods blessings to u all for good health-

  6. Rated 5 out of 5

    A. Bellin (verified owner)

    Have been taking Serracor-NK for about 3 years now. Has definitely cut down on the excess fibrin and mucus. Can breathe so much better too. Will continue with this product indefinitely as it has greatly helped my breathing.

  7. Rated 5 out of 5

    Raul (verified owner)

    my diagnosis has changed some; my lung condition has progressed Very fast, i had to cut down on my orders for serracor- NK and Serrapeptase do to “financial set back” So that might be the reason for the progressive cough and shortness of breath. But that’ will change soon!!

  8. Rated 5 out of 5

    Susan Tribull (verified owner)

    I’ve been using Serracor-NK for about 7 years now. The CoQ10 is great for energy and mental acuity! I’m pretty sure it’s the effect of the fibrin metabolism that supports my vision. I am 64 and still don’t wear glasses, for reading or otherwise. The magnesium support has a nice calming effect on the nerves, I find. I may get a cold every 5-6 years, but that’s it. I found out the hard way, by forgetting to pack my Serracor-NK for a trip, exactly what benefits I’m getting from this enzyme supplement. And I don’t want to be without it again! Thank you! It’s healthy in so many ways.

  9. Rated 5 out of 5

    Liljana Lili (verified owner)

    “I had problems breathing since 2013 and I am taking your products – Serracor NK, Serrapeptase and Floracor GI since early 2014. I never want to stop taking it all as that gave me confidence that my circulaion is supported. Also, I feel healthier in every way, because of taking those systemic enzymes.
    At beginning I was taking therapeutic doses, probably for one year. Then I started maintenance doses, twice a day. Than, as mid 2016 I noticed other health issues so I started taking therapeutic doses again (3 times per day 3 capsules each nattokinase and serrapeptase and floracor 2 times per day 2 capsules). Few weeks ago I decided to start taking same doses 2 times per day – (i feel much better now).

    Also, since mid 2016 my husband had started taking those same enzymes for his lungs and skin. We didn’t want to go with standard of care path, we found that enzymes are natural substitution to taking steroids and with no side effects. My husband is felling much better.
    We are both very grateful for your wonderful products nattokinase, serrapeptase and probiotics.”- Australia

  10. Rated 5 out of 5

    Leona Westbrook-Chilcott

    Enzymes are always a part of the protocol in Germany where they have wonderful success, so I gave my enzymes to my friend. I kept forgetting to order my own enzymes and after one week, I was in pain! It has helped my joint pain in my hands and feet significantly. Thank you for a great product. Leona

  11. Rated 5 out of 5

    Patrick Schuette (verified owner)

    Serracor-NK helps to clear my lungs of congestion and helps me breathe better. I would highly recommend it.

  12. Rated 5 out of 5

    Leslie Campbell (verified owner)

    No more chronic ear infections. They have cleared up now. My eustachan tube is not clogged and my hearing is back to normal. What a blessing!

  13. Rated 5 out of 5

    Darrell Geusz

    I have been using AST’s Serracor-NK combo’ed with AST’s Serrapeptase for 6 years. They have significantly helped keep my nose clear of congestion, my breathing clear of mucous and my lungs clear of constriction. Although I weigh over 300lbs and am over 40 years old, my blood pressure hovers around 120/70 when I regularly take the enzymes.

  14. Rated 5 out of 5


    I was injured very seriously 18 years ago and had many fractures and scars. I have been taking systemic enzymes since to manage my pain and inflammation. All of my scars are almost gone. I had raised scars on my hands that kind of looked like worms and a big scar in the middle of my forehead and one above my mouth. You can hardly see any of the scars. I can really tell a difference with my pain level if I stop taking Serracor. I will likely take it the rest of my life.

  15. Rated 5 out of 5

    listeningear22 (verified owner)

    I started taking Serracor and Serrapeptase about 7 years ago as I was diagnosed with PF and was told I had approx. 3 yrs to live. Last week I celebrated my 81st birthday and plan to have many more thanks to these enzymes. They without a doubt, turned the “no hope” diagnosis given to me to a future I can look forward to. Was told to have a biopsy, go on steroids but called AST enzymes instead and started my own protocol…….I’ll never regret that decision. I wrote a review 6 years ago but who knew I’d still be here to write another one…….Gaylen R

  16. Rated 5 out of 5

    Ione Maple

    I was very pleased with the effect this had on the swelling in my hands

  17. Rated 5 out of 5

    Robert Mills (verified owner)

    Since I have been using the Serracor for the past few years from AST Enzymes, I have not experienced swelling, aches, pain or skin redness in my calf. I have been very happy using this product.

  18. Rated 5 out of 5

    Coleta Lary (verified owner)

    Not only did Serracor help me get my LDL levels down, it also helped my daughter lower her trig. 200 points,

  19. Rated 5 out of 5

    James Macavoy

    Despite a very healthy lifestyle-diet, exercise- I ended up in a very inflammatory condition with pronounced pain, infections, high blood pressure etc… After embarking upon a Systemic Enzyme protocol, after 2 years, I am beginning to feel normal again.” Serracor was a part of my process. As a family, we use many AST products and find them all to be very helpful in maintaining our overall health. We have also recommended them to our friends who take them as well. Thank you for such fine, available, helpful products!

  20. Rated 5 out of 5

    Carlos Sanchez

    In 2006 I had an M.I. and 2 stents were placed in my right coronary artery. Detailed testing revealed I had a clotting issue that made my blood quite thick. 3 years later we went to a symposium on alternative treatment modalities and met Dr. Robert Brownstein. I was lucky enough to pick his brain during lunch, when he signed his book I’d just bought. He told me that it was imperative for me to thin my blood, as well as protect the vessel walls from inflammation. He recommended natto kinase and Xclyzyme, which I’ve always bought from AST. Recently I’ve learned of Serracor-NK and its better effect for the things I need. I made the switch and am pleased with this product.

  21. Rated 5 out of 5

    Joseph P Badding (verified owner)

    I have been using Serracor-NK in combination with Serrapeptase for the last few years off and on. I have noticed a definable improvement in my circulation and overall health when using these compared to the time when I have not use them. I have pulmonary fibrosis and what is left of my lungs works better with these enzymes.

  22. Rated 5 out of 5

    Edward Lidzbarski (verified owner)

    My wife and I both have been taking serracor-NK daily for well over 5 years. My wife is 68 and I am 69. We are no strangers to hard work. We own and operate a farm. Our blood pressures are both in the 120’s over 60’s. We walk 3 miles everyday, eat well and take 4 serracor-NK caps on an empty stomach before bed. We never have congestion and seldom experience sore joints. Injuries heal rapidly. This supplement is extremely good for your total health. We are both big fans!!!

  23. Rated 5 out of 5


    I take serracor-NK and other AST products because I want my arteries clear of plaque. I am deathly afraid of a stroke, I would rather die than be impaired.

  24. Rated 5 out of 5

    Jon DeFrance (verified owner)

    Improved oxygen levels — very satisfied

  25. Rated 5 out of 5

    Gretchen Foley

    Several years ago I was diagnosed with “sticky blood” and recommended for pharma drugs which was NOT going to happen. I wasn’t yet 50 years old, not overweight, but supposedly a candidate for a stroke! I also had very high blood pressure for which I also refused medication. (Stubborn yes, stupid perhaps). I took matters into my own hands and found Serracor-NK, ordered it and began to take one capsule twice a day increasing to about 2-3 twice a day. I also began walking a couple miles per week and eating as much dark leafy greens as possible with every meal. Within about 2 months time, I noticed that my scars were gradually disappearing (on hands and knees), and what was most noticeable was the ginormous blood clot on my shin (which looks like a gigantic bruise but in reality is a result of child-bearing) – it was shrinking in size and getting smaller. After 6 months, I got more bloodwork and my doctor was very surprised and happy and encouraged me to keep doing what I was doing. Now it’s years later, the clot area on my leg is a fraction of what it was; my blood pressure came down to NORMAL levels AND my blood is no longer “sticky”. When our son was diagnosed with lyme at 9 years old, we also had him take Serracor NK to break down the spirochete biofilm which we believe has worked. He’s a strong, healthy 15 year old with no signs of chronic lyme. Thank you AST Enzymes! I recommend you to everyone! Bless you for saving my life and the lives of my family!!!

  26. Rated 5 out of 5


    I am a 69 year old male. I have been taking Exclzyme for years based on a recommendation from my chiropractor. it has been a great help with inflammation and reducing my cholesterol. I take 6 per day.

  27. Rated 5 out of 5

    Greg Merhar (verified owner)

    Been using it for five years. Wonderful results! Overall health seems to be improved. Look much younger and am more vibrant than my peers. Look forward to continuing with the routine!

  28. Rated 5 out of 5

    Annette R Smith (verified owner)

    Has improved my circulation

  29. Rated 4 out of 5

    Roxanne Livingston

    I noticed my circulation improved, cold feet and hands warmed. I plan to reorder to see if serracor can help with mucus congestion and lung issues. From other reports, I suspect continuing on this product will assist in easing breathing problems. I may return and give it a 5 if I see continued improvement.

  30. Rated 5 out of 5

    JAMES HOLLAND (verified owner)

    Good general health, less muscle soreness after working out. I am an active 71 yrs, still playing hockey!

  31. Rated 5 out of 5


    I have been taking serracore-NK for 5 years. It has helped me control intentines inflammation after going through surgery. I have been doing very good since

  32. Rated 5 out of 5


    I have been taking serracore-NK every day since 5 years. It has helped me maintain a healthy life since my operation for chronic inflammatory intentines.

  33. Rated 4 out of 5

    Roland Brown

    Dramatic Improvements in Pulmonary Fibrosis

  34. Rated 5 out of 5

    Ron Worth (verified owner)

    I have been using Sarracor NK for over eight years and have noted a remarkable reduction in inflamation initially that has just gotten even better with time. I travel a lot for business with regular exercise. This has kept me healthy, free of inflammation in my joints, and with out any illnesses. I am 66 but during my physical this year my doctor felt the blood tests and other exams show the insides of a 40 year old, thank you!!

  35. Rated 5 out of 5


    I have been taking Serracor NK for about three years now for interstitial lung condition. I am also taking medication which is an immunosuppressant and has been prescribed by my pulmonary physician . I find when I take the Serracor, I have fewer breathing issues and my energy levels are higher. When I run out of Serracor I definitely feel the difference!

  36. Rated 5 out of 5

    Fletcher Redmond (verified owner)

    I take Serracor-NK about every day and so does my Wife. It keeps our chest and ears clear of congestion. It also helps me with pain and stiffness. It helps relieve sinus headaches better than anything I have ever tried. Thank you for this product that really works.

  37. Rated 5 out of 5

    Donald Weitz (verified owner)

    lowers my cholesterol ( a lot ). I have a condition that my blood clots easily this product helps greatly with this ( I’m on blood thinners(for 28 yrs) so u have to becareful because this thins your blood also the more Serracor-NK you take the less blood thinner I need ) It’s safe you just have to monitor your dosage until you know where your at with your INR reading. I’ve been taking this product since about 2008 I wouldn’t be without it. I believe this product would benefit any normal person (medically normal that is) for hi cholesterol & strokes. To me it’s like a miracle supplement. ( I had many blood clotting problems even though I was on thinners) with a antioxidant & Serracor-NK I’ve eliminated these problems for myself.

  38. Rated 5 out of 5

    Gretchen Vogel

    My husband and are both 66, and have individual health challenges we are addressing primarily with diet, exercise and supplements. I started seeing serrapeptasse in Lyme protocols but didn’t know what it was. After researching we found AST Enzymes. We started with Serrapeptase and the Floracor-GI, with astounding improvements in energy levels, digestion, feelings of well being, At this point I am adding the Ultimate Metabolic Formula and my husband will upgrade to Serracor-NK. This company and these enzymes have transformed our level of health. Everyone who we see says: you both look great! I think others are sensing our increased level of vitality, we are so grateful to have found AST.

  39. Rated 5 out of 5

    Gilda Sanne

    My issue is scarred lungs, I work out 4 days a week and had such trouble breathing.. I would get winded just stretching but not now. Feel stronger and way less winded when I take gym classes.
    Huge difference ! Being all natural convinced me to try it. So glad I did.
    All I can say is Thank you!!

  40. Rated 5 out of 5

    Linda Krumpelman (verified owner)

    I had my 87 year old mother try Serracor for a chronic cough she has had for decades. It really worked! She hardly ever coughs now and her energy and even her arthritis are better.

  41. Rated 5 out of 5

    RONALD HARRIS (verified owner)

    I am a male aged 51 and I want to say that I Love AST Enzymes Serracor-NK. It has really improved my health since I started taking it about over 2 years ago. My circulation, breathing, and general body flexibility all feel better when I take it and my whole body is less sore. Everything seems to heal faster and feel better. I want to thank AST Enzymes for their life changing products! I am a customer for life!
    Ronald Harris

Buy These Products Together and Save

  • Serracor-NK + Floracor-GI + FREE Digest-GI

    Total Price $200.97 $170.98
    Add all 3 to cart

    Buy Serracor-NK with Floracor-GI for Better Absorption.
    Start your systemic enzyme therapy the right way. Increase the effectiveness of systemic enzymes by taking Floracor-GI with Serracor together. Floracor-GI is a blend of probiotics and enzymes for optimal intestinal health and greater nutrient absorption.

    Combining the intestinal cleansing formula of Floracor-GI with the powerful systemic enzymes in Serracor-NK supports the body’s utilization of systemic enzymes, healthier circulation and inflammatory response.

    FREE Digest-GI WITH PURCHASE! – A $29.99 Value
    DigeSEB-GI is a broad-spectrum digestive enzyme blend for optimal digestion of all foods. Digest-GI reduces stress on the gastrointestinal mucosa, which can boost immunity and decrease inflammation while enhancing the body’s nutrient intake and energy production.

    1-Serracor-NK 300 capsules + 1-Floracor-GI 180 caps + 1-Digest-GI 90 caps =$200.97 NOW $170.98