Bromelain has the most behind it. Added before scheduled dental or orthopaedic surgery, it fades the swelling a day or two faster 1; on any old random bruise it does much less 2. In acute sinusitis it clears symptoms about a day sooner 3.
Polyenzyme tablets (bromelain plus trypsin plus rutoside) matched diclofenac for knee-arthritis pain over three weeks, with fewer stomach complaints 4 5. Useful when NSAIDs are off the table.
Nattokinase nudges blood pressure down about 5 over 3 mmHg at 2000 fibrinolytic units a day, and thins the blood 6. No heart-attack-or-stroke trial exists; it's all intermediate markers 7.
Serrapeptase and papain are the weak end. Serrapeptase has old, small, industry-tied trials and a marketing story far past them 8; oral papain rides almost entirely on bromelain's data.
Match the enzyme to the job, and mind the empty stomach.
The fine print — when to skip it, and what people get wrong
These thin your blood. Stop them at least 7 days before any surgery, extraction, or biopsy, and tell whoever's operating. Don't add them to a prescribed thinner (warfarin, apixaban, clopidogrel, cardiology-dose aspirin) on your own; nattokinase is not a substitute for a real anticoagulant. Avoid with a pineapple or papaya allergy, and in pregnancy.
"Take with meals for inflammation" is backwards and on most bottles; with food you get only the weak digestion effect. "Daily enzymes fix bloating" is mostly false 9. Serrapeptase does not dissolve fibroids, plaque, or scar tissue — no controlled trial, no mechanism 8.
Why it "didn't work": taken with food when you wanted the systemic effect; an underdosed brand (two "500 mg" bottles can differ fourfold in active enzyme); uncoated serrapeptase, inert before the gut; or expecting a same-day hit, when the effect builds over 48 to 72 hours.
- 1Inchingolo F, Tatullo M, Marrelli M, Inchingolo AM, Picciariello V, Inchingolo AD, Dipalma G, Vermesan D, Cagiano R (2010). Clinical trial with bromelain in third molar exodontia. European Review for Medical and Pharmacological Sciences. link
- 2Jutte LS, Hawkins J, Miller KC, Long BC, Knight KL (2015). Effectiveness of bromelain on lower-extremity contusions. Journal of Athletic Training. link
- 3Braun JM, Schneider B, Beuth HJ (2005). Therapeutic use, efficiency and safety of the proteolytic pineapple enzyme bromelain-POS in children with acute sinusitis in Germany. In Vivo. link
- 4Klein G, Kullich W (2000). Short-term treatment of painful osteoarthritis of the knee with oral enzymes: a randomised, double-blind study versus diclofenac. Clinical Drug Investigation. link
- 5Akhtar NM, Naseer R, Farooqi AZ, Aziz W, Nazir M (2004). Oral enzyme combination versus diclofenac in the treatment of osteoarthritis of the knee — a double-blind prospective randomized study. Clinical Rheumatology. link
- 6Kim JY, Gum SN, Paik JK, Lim HH, Kim KC, Ogasawara K, Inoue K, Park S, Jang Y, Lee JH (2008). Effects of nattokinase on blood pressure: a randomized, controlled trial. Hypertension Research. link
- 7Chen H, McGowan EM, Ren N, Lal S, Nassif N, Shad-Kaneez F, Qu X, Lin Y (2018). Nattokinase: a promising alternative in prevention and treatment of cardiovascular diseases. Biomarker Insights. link
- 8Bhagat S, Agarwal M, Roy V (2013). Serratiopeptidase: a systematic review of the existing evidence. International Journal of Surgery. link
- 9Roxas M (2008). The role of enzyme supplementation in digestive disorders. Alternative Medicine Review. link
Proteolytic Enzymes
Roughly $30-150 USD per year for moderate dosing of a single enzyme at adequate strength; polyenzyme combinations run somewhat higher. Trivial cost in absolute terms.
A capsule or two per day, taken on an empty stomach for systemic indications, typically for a 1-4 week course around an acute event. Trivial daily effort; the meaningful friction is the empty-stomach timing rule.
Modest measurable benefit for discrete acute inflammatory episodes: bromelain shortens acute-sinusitis symptom course by ~1 day in Braun 2005; polyenzyme combinations non-inferior to diclofenac for osteoarthritis pain over six weeks with lower GI burden (Klein 2000, Akhtar 2004); nattokinase delivers a replicated ~5 mmHg systolic reduction in mild hypertension (Kim 2008). Small-but-real for the right indication, not transformative.
Multiple small RCTs in dental/orthopaedic swelling (Inchingolo 2010), acute sinusitis (Braun 2005), osteoarthritis (Klein 2000, Akhtar 2004, Tilwe 2001), and nattokinase blood pressure (Kim 2008); Castell 1997 establishes intact intestinal absorption of bromelain. But cohort sizes small, studies industry-heavy, the cleaner Jutte 2015 athletic-contusion RCT was negative, and serrapeptase remains essentially unreplicated outside its commercial sphere (Bhagat 2013).
Small literature signal that bromelain accelerates resolution of post-traumatic bruising (Inchingolo 2010 third-molar trial; Walker 2002 open dose-response). Effect is modest and confined to discrete bruise/swelling episodes, not an everyday cosmetic outcome.