Key Takeaways
- These enzymes help break down fibrin, a protein in blood clots
- Nattokinase has the best human heart-health research of the four
- Serrapeptase and bromelain are studied more for swelling and inflammation
- Lumbrokinase is a strong fibrin-clearing enzyme from earthworms
- Food quality and meal rhythm still matter most for vascular health
Blood needs to flow with ease. The body makes clots to stop bleeding, then clears them when the job is done. This clean up step helps keep blood moving through small and large vessels. A group of enzymes may help with that process. These include nattokinase, serrapeptase, lumbrokinase, and bromelain. Each one works in a different way, and each has a different level of research behind it.
Nattokinase
Nattokinase is an enzyme found in natto, a fermented soybean food from Japan. It is made during fermentation by Bacillus subtilis. Scientists first drew notice to nattokinase after finding that it could break down fibrin, the net-like protein that helps form a clot (Chen et al., 2018). Fibrin is useful when the body needs to seal a wound. Trouble can start when too much fibrin stays in place. That can make blood thicker and flow less well.
Natural fibrinolytic enzymes are also found in some other fermented foods. A recent review of food-based enzymes notes that these compounds are of interest because they can help break down fibrin and support the body’s own clot-control system (Wang et al., 2023).
Benefits of Nattokinase
Of the enzymes in this article, nattokinase has the strongest human research for heart and vessel health. A meta-analysis published in 2024 found that nattokinase supplementation lowered systolic and diastolic blood pressure in the trials it reviewed (Li et al., 2024). Nattokinase has enough human data to stand out from the rest of this group.
Researchers also study nattokinase for its effect on fibrin, blood flow, and other markers tied to vascular health. Reviews describe it as a promising enzyme for circulation support, while also noting that more strong trials are still needed (Chen et al., 2018).
Serrapeptase
Serrapeptase, also called serratiopeptidase, is a proteolytic enzyme. That means it breaks proteins into smaller parts. It was first linked with bacteria found in the gut of the silkworm.
This enzyme is not mainly known for direct heart effects. It is better known for work on swelling, mucus, and tissue debris. Reviews describe it as an anti-inflammatory enzyme, but also note that the clinical evidence is mixed and not very strong in many areas (Tiwari, 2017).
Benefits of Serrapeptase
Serrapeptase gets attention because chronic inflammation can harm blood vessels over time. If an enzyme helps clear inflammatory debris, that may support better tissue function.
Still, this point needs care. The best review data says the evidence for serrapeptase is limited, and long-term safety data are also limited (Bhagat et al., 2013).
So its value in cardiovascular health is more indirect than direct. It may help by lowering swelling and protein waste in tissues, but it does not have the same level of heart-specific human evidence as nattokinase. That makes serrapeptase more of a side player in this group. It may fit a broad plan aimed at reducing inflammation, but it should not be framed as a proven heart-health tool.
Lumbrokinase
Lumbrokinase is a group of enzymes taken from earthworms. It is known for strong fibrin-breaking action. Reviews of natural fibrinolytic enzymes list lumbrokinase as one of the more active agents in this field (Hazare et al., 2024). Older lab work found that earthworm-derived enzymes can dissolve fibrin well, which is why lumbrokinase drew interest in the first place (Mihara et al., 1991).
Benefits of Lumbrokinase
Lumbrokinase is often described as more fibrin-specific than many other enzymes. In plain words, that means it may focus more on fibrin and less on other proteins. That feature is one reason it is studied for blood flow and clot balance.
Reviews discuss its use in thrombosis and circulation research, but most of the stronger claims still need better human trials in broader groups (Hazare et al., 2024). Lumbrokinase is a potent enzyme with a strong theory behind it. The clinical proof is still thinner than many supplement ads suggest.
Bromelain
Bromelain is a mix of enzymes from pineapple, most of all the stem. It is a proteolytic enzyme, so it helps break down proteins. It has been studied for swelling, pain, tissue healing, and immune effects.
Modern reviews describe bromelain as anti-inflammatory, anti-edema, and antithrombotic in a range of lab and animal work (Varilla et al., 2021).
Benefits of Bromelain
Bromelain is often grouped with circulatory enzymes because inflammation and clotting affect each other. A vessel under stress tends to become more sticky and inflamed. An enzyme that helps calm swelling may support better flow.
At the same time, most of the strongest bromelain evidence is still for inflammation and swelling rather than direct heart endpoints. A recent review also notes these anti-inflammatory effects, while calling for more high-quality human trials (Kansakar et al., 2024).
Enzymes & Drug Care
These enzymes are not the same as clot-busting drugs or prescription blood thinners. Drugs act in a stronger and more direct way. In emergency care, that can save life and tissue.
Natural enzymes work in a softer way. They support the body’s own systems for clearing fibrin and protein debris. That does not make them weak. It means their role is different.
Food
The body builds enzymes from amino acids and minerals. Nutrient dense meals support that work. One to three meals per day may also help reduce constant blood sugar swings and snacking stress.
Enzyme support works best when the rest of the diet is solid. That means enough protein, enough animal fat, fewer ultra-processed foods, and less seed oil. Fermented foods may also add useful compounds, though not every enzyme can be gained in a food amount that matches a supplement dose. For cardiovascular health, nattokinase has the strongest human evidence in this group. Lumbrokinase looks potent but needs more good human data. Serrapeptase and bromelain may help more with swelling and tissue stress than with direct heart outcomes. That is the plain reading of the evidence now.
Consult a licensed healthcare professional before starting, stopping, or changing any diet, supplement, medication, or wellness practice. For questions about a medical condition or symptoms, seek advice from a qualified clinician who can assess your situation.
FAQs
What does fibrinolytic mean?
It means breaking down fibrin. Fibrin is the protein mesh that helps make a blood clot.
Which enzyme has the best human research for circulation?
Nattokinase has the best human research in this group for blood pressure and circulation markers.
Is serrapeptase a heart enzyme?
Not mainly. It is studied more for swelling, mucus, and inflammatory tissue debris.
Why is lumbrokinase called a strong enzyme?
It has strong fibrin-breaking action and may be more specific to fibrin than some other enzymes.
Can bromelain help blood flow?
It may help in a support role by lowering swelling and tissue stress, but the best evidence is still not for major heart outcomes.
Research
Chen, H. et al. (2018) ‘Nattokinase: A Promising Alternative in Prevention and Treatment of Cardiovascular Diseases’, Biomarker Insights. Link
Wang, P. et al. (2023) ‘Research progress on the fibrinolytic enzymes produced from microorganisms and their applications’, Heliyon. Link
Li, X. et al. (2024) ‘Nattokinase Supplementation and Cardiovascular Risk Factors: A Systematic Review and Meta-Analysis of Randomized Controlled Trials’, Nutrients. Link
Tiwari, M. (2017) ‘The role of serratiopeptidase in the resolution of inflammation’, Asian Journal of Pharmaceutical Sciences. Link
Hazare, C. et al. (2024) ‘Diverse origins of fibrinolytic enzymes: A comprehensive review’, Heliyon. Link
Mihara, H. et al. (1991) ‘A novel fibrinolytic enzyme extracted from the earthworm, Lumbricus rubellus’, Japanese Journal of Physiology. Link
Varilla, C. et al. (2021) ‘Bromelain, a Group of Pineapple Proteolytic Complex Enzymes’, Current Pharmaceutical Design. Link
Kansakar, U. et al. (2024) ‘Exploring the Therapeutic Potential of Bromelain: Current Knowledge and Prospective Uses’, Biomedicines. Link
Kasim, M., Kiat, A.A., Rohman, M.S., Hanifah, Y. & Kiat, H. (2015) ‘Lumbrokinase for prevention of ischemic stroke: A systematic review and meta-analysis’, Drug Design, Development and Therapy. Link
Jensen, G.S., Lenninger, M., Ero, M.P. & Benson, K.F. (2016) ‘Consumption of nattokinase is associated with reduced blood pressure and von Willebrand factor, a cardiovascular risk marker: Results from a randomized, double-blind, placebo-controlled multicenter North American clinical trial’, Scientific Reports. Link
Kim, J.Y., Gum, S.N., Paik, J.K., Lim, H.H., Kim, K.C., Ogasawara, K., Inoue, K., Park, S., Jang, Y. & Lee, J.H. (2008) ‘Effects of nattokinase on blood pressure: A randomized, controlled trial’, Hypertension Research. Link
Hsia, C.H., Shen, M.C., Lin, J.S., Wen, Y.K., Hwang, K.L., Cham, T.M. & Yang, N.C. (2009) ‘Nattokinase decreases plasma levels of fibrinogen, factor VII, and factor VIII in human subjects’, Nutrition Research. Link
Kee, W.H., Tan, S.L., Lee, V. & Salmon, Y.M. (1989) ‘The treatment of breast engorgement with serrapeptase (Danzen): A randomized double-blind controlled trial’, Singapore Medical Journal. Link
Mazzone, A., Catalani, M., Costanzo, M., Drusian, A., Mandoli, A., Russo, S., Guarini, E. & Vesperini, G. (1990) ‘Evaluation of serrapeptase in acute or chronic inflammation of otorhinolaryngology pathology: A multicentre, double-blind study versus placebo’, International Journal of Clinical Pharmacology, Therapy, and Toxicology. Link
Sumi, H., Hamada, H., Tsushima, H., Mihara, H. & Muraki, H. (1987) ‘A novel fibrinolytic enzyme (nattokinase) in the vegetable cheese natto; a typical and popular soybean food in the Japanese diet’, Experientia. Link
Maurer, H.R. (2001) ‘Bromelain: Biochemistry, pharmacology and medical use’, Cellular and Molecular Life Sciences. Link
Pavan, R., Jain, S., Shraddha & Kumar, A. (2012) ‘Properties and therapeutic application of bromelain: A review’, Biotechnology Research International. Link
Taussig, S.J. & Batkin, S. (1988) ‘Bromelain, the enzyme complex of pineapple (Ananas comosus) and its clinical application. An update’, Journal of Ethnopharmacology. Link
Bhagat, S., Agarwal, M. & Roy, V. (2013) ‘Serratiopeptidase: A systematic review of the existing evidence’, International Journal of Surgery. Link
Mine, Y., Wong, A.H.K. & Jiang, B. (2005) ‘Fibrinolytic enzymes in Asian traditional fermented foods’, Food Research International. Link
Choi, N.S., Song, J.J., Chung, D.M., Kim, Y.J., Maeng, P.J. & Kim, S.H. (2005) ‘Purification and characterization of a novel fibrinolytic enzyme from Bacillus sp. isolated from fermented soybean food’, Journal of Biochemistry and Molecular Biology. Link
Uchida, S., Yamada, Y., Kato, H. & Sumi, H. (2015) ‘Nattokinase: A potent blood-clot dissolving enzyme with cardiovascular benefits’, International Journal of Molecular Sciences. Link
Secor, E.R. Jr., Carson, W.F., Singh, A., Pensa, M., Guernsey, L.A., Schramm, C.M. & Thrall, R.S. (2005) ‘Oral bromelain attenuates inflammation in an ovalbumin-induced murine model of asthma’, Cellular Immunology. Link
Fitzhugh, D.J., Shan, S., Dewhirst, M.W. & Hale, L.P. (2008) ‘Bromelain treatment decreases neutrophil migration to sites of inflammation’, Clinical Immunology. Link
Verma, S., Singh, A. & Mishra, A. (2017) ‘Serratiopeptidase: Insights into the therapeutic applications’, Biotechnology Reports. Link
