Bromelain (Pineapple Enzyme)

📜 Historical Use

Bromelain is derived from the stem of the pineapple plant (Ananas comosus), the part discarded in fruit processing. Pineapple preparations have a long history of traditional use in Central and South America for digestive complaints and wound care, which is consistent with what the isolated enzyme is now understood to do — break down proteins.

📊 What the Research Shows

The honest summary is that the evidence is good for some uses and unsettled for others. Bromelain is effective for burn wound debridement in clinical settings, and shows benefit for reducing post-operative pain and swelling. For arthritis — one of its most common consumer uses — results from clinical trials are mixed. For cancer, the proposed mechanisms come from laboratory work and have not been studied in humans; Memorial Sloan Kettering notes that well-designed randomized trials are needed to evaluate any anticancer potential. Anyone selling bromelain as a cancer therapy is going well beyond the evidence.

Bromelain is taken as an oral supplement, and is also used topically in clinical burn debridement — a hospital procedure, not something to attempt at home. Potency is not fully described by weight alone, because what matters is enzyme activity; check the product label and discuss the appropriate form with a clinician, particularly if you are taking any medication listed in the interactions section below.

Allergic reactions to bromelain have been reported. Because it reduces platelet aggregation, it should be avoided if you are taking anticoagulants such as warfarin, and avoided alongside tetracycline antibiotics, whose blood and urine levels it can raise. If you are scheduled for surgery, tell your surgeon you are taking it — the same anti-platelet effect that helps with post-operative swelling can increase bleeding risk during a procedure.

This is the section that matters most, because bromelain has a real anti-platelet effect rather than a theoretical one. Preclinical studies indicate increased bruising and bleeding risk when combined with warfarin or other blood thinners. With tetracycline antibiotics, bromelain may increase blood and urine levels of the drug. In vitro work shows inhibition of CYP450 2C9, an enzyme that clears a number of common prescriptions, although the clinical relevance of that finding is not yet established. Because of the bleeding risk, it should also be discussed with a surgeon before any planned operation.

1. Bromelain — Integrative Medicine clinical summary — Memorial Sloan Kettering Cancer Center MSKCC About Herbs (2026)[mskcc ↗]