Ananain

EnzymeBest taken away from food

What is it

Ananain is a cysteine protease enzyme found in pineapple stems (Ananas comosus) and one of the components of the bromelain enzyme complex. Like other proteolytic enzymes, it digests proteins by cleaving peptide bonds and is studied for its anti-inflammatory and digestive properties.

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Anti-inflammatory and post-surgical recovery (as part of bromelain)

Limited Evidence

Bromelain (which contains ananain) has clinical evidence for reducing swelling, bruising, and pain after surgery or injury. Ananain's specific contribution has not been isolated.

Digestive enzyme support

Limited Evidence

Used with meals as part of bromelain enzyme blends to support protein digestion, particularly in people with low stomach acid or pancreatic insufficiency.

How it works

Ananain is part of the bromelain mixture obtained from pineapple, alongside other proteases such as stem bromelain and fruit bromelain. It is a sulfhydryl protease that cleaves peptide bonds adjacent to specific amino acid residues. After ingestion, a portion of ananain (and other bromelain components) is absorbed intact across the gut wall and retains some enzymatic activity in plasma. Systemic absorbed proteases are thought to contribute to bromelain's anti-inflammatory and fibrinolytic effects observed in clinical trials, including reduced edema after surgery or injury, modest pain reduction in arthritis, and possible reduction of platelet aggregation. Ananain specifically has not been as well studied as a stand-alone agent; most evidence comes from bromelain preparations that contain it as one component.

Dosage

There is no RDA. Ananain is rarely sold alone; it is most often present in bromelain preparations dosed at 200 to 2,000 mg per day, often standardized in GDU (gelatin dissolving units) or MCU (milk clotting units). Clinical anti-inflammatory dosing usually exceeds 500 mg per day.

When and how to take it

For anti-inflammatory effects, take on an empty stomach (30 minutes before or 2 hours after meals) so the enzymes are absorbed rather than used in digestion. For digestive support, take with meals so the enzymes act on food proteins. Split doses through the day for sustained activity.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Bromelain complex (contains ananain)

Most ananain exposure comes from bromelain supplements derived from pineapple stems.

Partially absorbed intact; retains some activity systemically.

Safety

Generally well tolerated. Common side effects include GI upset, diarrhea, and allergic reactions in people sensitive to pineapple. Bromelain preparations may increase bleeding risk at higher doses. No formal Tolerable Upper Intake Level has been established.

Who should be cautious

People with pineapple allergy should avoid. Discontinue at least one week before surgery to reduce bleeding risk. Pregnant women should avoid concentrated supplements due to limited safety data. People on anticoagulants should consult a clinician.

Interactions

Bromelain (and likely ananain) may enhance absorption and effect of certain antibiotics (amoxicillin, tetracycline). May increase bleeding risk when combined with anticoagulants, antiplatelet drugs, or NSAIDs. Mild theoretical interactions with sedatives.

Food sources

Fresh pineapple (stem and core)

Amount
1 cup
%DV
—

Frequently asked questions

Is ananain the same as bromelain?⌄

Ananain is one of several proteolytic enzymes in the bromelain complex. Bromelain refers to the whole mixture from pineapple.

Should I take ananain alone?⌄

Ananain is rarely sold alone. Most products containing it are full bromelain supplements with multiple proteases.

Does ananain survive stomach acid?⌄

Some proteolytic activity survives stomach acid, and a portion of bromelain enzymes are absorbed intact. Enteric-coated formulations may improve systemic delivery.

References

Ananain on Wikidata — Wikidata link

Ananain on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Ananain (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.