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Bromelain

Ananas comosus
Evidence Level
Moderate
2 Clinical Trials
4 Documented Benefits
3/5 Evidence Score

Bromelain is a group of protein-digesting enzymes extracted from pineapple stems, used in two main ways depending on timing. Taken with meals, it aids protein digestion; taken between meals on an empty stomach, it is absorbed and studied for easing swelling, bruising, and inflammation (for example after injury or surgery) and for sinus comfort, often paired with quercetin. It is generally well tolerated, though it can have a mild blood-thinning effect and may increase the activity of certain antibiotics, so those on anticoagulants or other medications should check with a doctor. People allergic to pineapple should avoid it.

Studied Dose 200–400 mg/day (500–2,000 GDU) for anti-inflammatory; 400–800 mg/day with meals for digestion
Active Compound Bromelain (measured in GDU/g or MCU/g) — stem-derived proteolytic enzyme complex

Benefits

Anti-inflammatory and pain relief

Bromelain reduces prostaglandin production, bradykinin activity, and inflammatory cytokines. Multiple RCTs show comparable efficacy to NSAIDs for joint pain, sinusitis, and surgical tissue swelling.

Supported by Trial 2, Trial 1

Digestive enzyme support

Bromelain breaks down dietary proteins in the GI tract, improving digestion and reducing protein-related bloating and discomfort. Clinically useful in pancreatic enzyme insufficiency.

Supported by Trial 2, Trial 1

Post-exercise recovery

Studies show bromelain reduces DOMS (delayed onset muscle soreness) markers, swelling, and recovery time after intense exercise, accelerating return to training.

Supported by Trial 2

Sinus and respiratory support

European clinical trials show bromelain significantly reduces nasal inflammation, congestion, and mucus production in sinusitis with effects comparable to pharmaceutical decongestants.

Supported by Trial 2

Mechanism of action

1

Prostaglandin synthesis inhibition

Bromelain inhibits cyclooxygenase (COX) enzymes and thromboxane production, reducing prostaglandin E2 and other pro-inflammatory eicosanoids — similar mechanism to NSAIDs but with fewer GI side effects.

2

Fibrinolytic activity

Bromelain cleaves fibrinogen and degrades fibrin clots, reducing blood viscosity and platelet aggregation. This fibrinolytic effect supports circulation and reduces edema formation after injury.

3

Immune cell modulation

Bromelain alters CD44 surface marker expression on T-cells, shifts immune responses from Th2 to Th1 type, and enhances NK cell cytotoxicity and immune surveillance.

Clinical trials

1
Bromelain vs Diclofenac for Osteoarthritis — Clinical Trial

Randomized controlled trial comparing bromelain (90 mg three times daily, total 270 mg/day) vs diclofenac (100 mg/day, slow-release) in 90 patients with painful osteoarthritis of the knee for 6 weeks. Outcomes: pain, stiffness, function (Lequesne index), tolerability. (Clin Rheumatol)

90 patients with knee osteoarthritis. 6-week intervention.

Bromelain and diclofenac produced similar reductions in pain, stiffness, and functional impairment. Both groups improved significantly. Bromelain group experienced significantly fewer GI side effects. Note: bromelain dose used was relatively low (270 mg/day); higher doses (1000-2000 mg/day) are used in some clinical applications. Single trial — replication needed.

2
Bromelain for Sinusitis — Evidence Review

Evidence review of clinical studies examining bromelain for acute or chronic rhinosinusitis. Outcomes: nasal inflammation, congestion, duration of illness, recovery time. (Guo et al. 2006, In Vivo)

Pooled across multiple sinusitis trials.

Bromelain reduced nasal inflammation, swelling, and congestion scores vs placebo or standard care alone. Duration of illness was shortened. Mechanism likely involves proteolytic activity reducing fibrin deposits and pro-inflammatory mediators. Note: bromelain is used as adjunctive therapy alongside standard sinusitis treatment in some European clinical practices.

Side effects and drug interactions

Common Potential side effects

GI effects (nausea, diarrhea) at high doses or with concurrent food intake
Allergic reactions in pineapple-sensitive individuals or those with latex allergy
Increased bleeding risk at high doses due to fibrinolytic activity

Important Drug interactions

Anticoagulants (warfarin, aspirin) — fibrinolytic activity increases bleeding risk; monitor INR
Antibiotics (amoxicillin, tetracycline) — bromelain increases antibiotic absorption and blood levels
ACE inhibitors — may increase drug levels; monitor blood pressure

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Frequently asked questions about Bromelain

What is bromelain?

Bromelain is a group of protein-digesting enzymes from pineapple stems. It is used both as a digestive aid and, taken between meals, for anti-inflammatory and recovery support, especially for swelling and sinus comfort.

What is bromelain used for?

With meals, it aids protein digestion; between meals, it is studied for easing swelling, bruising, and inflammation (for example after injury or surgery) and for sinus and nasal comfort. It is often combined with quercetin.

When should I take bromelain?

For digestion, take it with meals. For anti-inflammatory or recovery purposes, take it on an empty stomach so it is absorbed systemically rather than used on food.

Does bromelain have side effects?

It is generally well tolerated; some people get mild digestive upset. It can have a mild blood-thinning effect and may increase the effect of antibiotics or blood thinners, so check with your doctor if relevant. Those allergic to pineapple should avoid it.

What is the recommended dosage of Bromelain?

The clinically studied dose is 200–400 mg/day (500–2,000 GDU) for anti-inflammatory; 400–800 mg/day with meals for digestion Always follow the product label and check with a healthcare provider for personal advice.

Is Bromelain safe, and does it have side effects?

For most healthy adults, Bromelain is well tolerated at studied doses. Reported effects can include: GI effects (nausea, diarrhea) at high doses or with concurrent food intake Allergic reactions in pineapple-sensitive individuals or those with latex allergy It may also interact with some medications. Bromelain is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Bromelain interact with any medications?

Possible interactions include: Anticoagulants (warfarin, aspirin) — fibrinolytic activity increases bleeding risk; monitor INR Antibiotics (amoxicillin, tetracycline) — bromelain increases antibiotic absorption and blood levels If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Bromelain?

NutraSmarts rates the evidence for Bromelain as Moderate (3 out of 5). It is backed by 2 clinical trials and 4 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(4 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Brien S, Lewith G, Walker AF, Middleton R, Prescott P, Bundy R. Bromelain as an adjunctive treatment for moderate-to-severe osteoarthritis of the knee: a randomized placebo-controlled pilot study. QJM. 2006;99(12):841-50. doi: 10.1093/qjmed/hcl118.PubMedUsed to support: Small placebo-controlled pilot RCT (31 completers) of bromelain 800 mg/day for moderate-to-severe knee OA found no significant benefit over placebo on WOMAC or other measures, so it does not support the OA-pain claim and reads as a null result.
  2. Mendes ML, do Nascimento-Junior EM, Reinheimer DM, Martins-Filho PR. Efficacy of proteolytic enzyme bromelain on health outcomes after third molar surgery. Systematic review and meta-analysis of randomized clinical trials. Med Oral Patol Oral Cir Bucal. 2019;24(1):e61-e69. doi: 10.4317/medoral.22731.PubMedUsed to support: Systematic review and meta-analysis of RCTs after mandibular third molar surgery found bromelain reduced postoperative pain but had no significant effect on facial swelling or trismus, giving mixed support for the post-surgical edema/inflammation claim.
  3. Buttner L, Achilles N, Bohm M, Shah-Hosseini K, Mosges R. Efficacy and tolerability of bromelain in patients with chronic rhinosinusitis--a pilot study. B-ENT. 2013;9(3):217-25..PubMedUsed to support: Small open-label, uncontrolled pilot study (12 patients) reported improved symptom scores and quality of life after 3 months of oral bromelain in chronic rhinosinusitis, offering only weak, non-randomized support for the sinusitis claim.
  4. Stone MB, Merrick MA, Ingersoll CD, Edwards JE. Preliminary comparison of bromelain and Ibuprofen for delayed onset muscle soreness management. Clin J Sport Med. 2002;12(6):373-8. doi: 10.1097/00042752-200211000-00009.PubMedUsed to support: Small randomized double-blind trial found neither bromelain nor ibuprofen reduced elbow-flexor pain, range-of-motion loss, or strength loss after eccentric exercise, so it does not support the muscle-soreness (DOMS) claim and reads as a null result.