Bromelain: What the Trials Show and How to Read the Label

By Erin Rose · Updated July 19, 2026 · Methodology

Educational overview — not medical advice. Bromelain is not a substitute for medical or dental care, and has a possible bleeding-potentiation interaction worth a clinician check before surgery or on anticoagulants. This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.

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What bromelain is, and what has been studied

Bromelain is a mixture of proteolytic (protein-digesting) enzymes extracted from pineapple stems, sold as a supplement for its proposed antiedematous and anti-inflammatory activity. It is not an essential nutrient — there's no deficiency state, no RDA, and no government-set upper limit — so any benefit has to stand on its own trial evidence. Two threads run through the trials and reviews we reviewed. The larger one is swelling after dental surgery, built almost entirely on third-molar (wisdom tooth) extraction RCTs: a 2019 systematic review and meta-analysis of 6 RCTs (Liu et al. 2019) reported less facial swelling at both early (P=.03) and late (P=.0004) timepoints and less pain at the later day-7 timepoint (P=.002) — but found "no apparent effect on early or late trismus," the limited-jaw-opening measure. The second, thinner thread is sinus symptoms: a pharmacokinetic study (Passali et al. 2018) reported bromelain reaches sinonasal tissue after oral dosing, plus one small, open-label, uncontrolled pilot (Büttner et al. 2013, n=12) that reported average symptom improvement. That is early data, not proof of any effect.

The GDU-vs-mg trap — the #1 buyer-relevant fact

Bromelain's proteolytic potency is assayed in activity units — most commonly GDU (Gelatin Digesting Units), also seen as MCU (Milk Clotting Units) or FIP (International Pharmaceutical Federation units, the system used in several German-language trials cited on this site). There is no single public conversion factor that works reliably across brands, because potency is assayed per manufacturing batch. That means a "500mg" bromelain capsule tells you almost nothing about dose on its own: among the products tracked on this site, one discloses 1,200 GDU and another discloses 3,000 GDU at that identical 500mg label weight — a 2.5x activity spread. One tracked product discloses mg but no GDU figure at all, a real labeling gap. See best bromelain for the cost-per-1,000-GDU ranking and the dosage guide for the full unit-system explanation.

Safety, briefly

Generally well tolerated across the trials reviewed; mild GI upset is the most commonly reported adverse effect. Four things worth knowing: bromelain has a possible antiplatelet/bleeding-potentiation effect (ex vivo human-blood data, Kaur et al. 2016) and appears on standard herb-warfarin interaction lists — check with a clinician if you take anticoagulants or before any planned surgery; there's a real pineapple/papain/latex allergy cross-reactivity risk; the "boosts antibiotic absorption" claim traces to a 1986 rat study only, never proven in humans; and claims that bromelain treats cancer are not supported — the underlying cancer research is in-vitro and animal work.

Frequently asked questions

Related guides

• Quercetin — frequently paired with bromelain in combination products; see why the pairing itself isn't independently trial-proven
• Curcumin — another plant-derived anti-inflammatory with its own absorption caveats
• MSM — another joint-supplement ingredient
• Glucosamine — another joint-supplement ingredient
• Boswellia — another botanical studied for joints

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