Bromelain: Pineapple-Derived Enzyme for Inflammation and Sinusitis

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Bromelain is a protein-cleaving enzyme complex extracted from pineapple stem or fruit. It has been used for decades in European medicine for post-surgical swelling and sinusitis, with a modest but credible evidence base that has not fully translated into North American practice.

Sinusitis evidence

Bromelain has been studied in acute rhinosinusitis with mixed but mostly favourable trial results, including a paediatric RCT showing faster symptom resolution. The German Commission E monograph supports use of bromelain (80–320 mg/day in divided doses, 7–10 days) for acute sinusitis as an adjunct to standard care, and bromelain remains available in many European pharmacies as an OTC option.

Post-surgical swelling

Trials in oral, orthopaedic, and plastic surgery have generally shown that bromelain modestly reduces post-operative swelling, bruising, and pain compared to placebo, with consistent but small effect sizes (roughly 20–30% reduction in oedema scores in many trials). Bromelain is used routinely in some European surgical centres; in the US it is more commonly patient-initiated than physician-prescribed.

Osteoarthritis and soft-tissue injury

A clinical-studies review of bromelain in osteoarthritis concluded that doses of 540–1,890 mg/day produced clinically meaningful pain relief in mild-to-moderate knee OA, with effect size in some trials approaching that of standard NSAIDs but with better GI tolerability (Brien 2004, Evidence-Based Complementary and Alternative Medicine). Head-to-head trials with NSAIDs are limited.

Mechanism

Bromelain reduces several pro-inflammatory mediators, modulates fibrin breakdown, and has mild anti-platelet effects. A portion of orally ingested bromelain remains enzymatically active after absorption (Maurer 2001; PMID 11577981), which is unusual for an orally-dosed proteolytic enzyme and is part of the basis for systemic anti-inflammatory effects.

Safety and practical use

For systemic anti-inflammatory effect, take between meals on an empty stomach; with food, bromelain acts mostly as a digestive enzyme instead. Standard dose ranges from 500 GDU (~500 mg) two to three times daily for inflammatory indications. Main risks: mild anti-platelet effect (caution with warfarin, DOACs, antiplatelet drugs, and perioperatively); rare allergic reaction in people with pineapple, latex, or related allergies; occasional GI upset. Stop 1–2 weeks before elective surgery.