Papain

Papaya enzyme

Snapshot

Indications	Contraindications
Wound healing¹ Mild to moderate acne²	Papain hypersensitivity³ Latex or fruit allergy⁴ Stomach ulcer⁵ Pregnancy or lactation⁵

Papain is a proteolytic enzyme from Carica papaya, used across food, pharmaceutical, and cosmetic products^{6, 7}. Its protein-cleaving activity drives its uses: oral digestive enzyme supplements, topical wound care, and topical skin products. Digestive support is the usual reason adults take it by mouth.

Human research is limited to about nine small trials, mostly topical or dental, covering wounds, periodontitis, acne, and facial hirsutism. A systematic review of wound use found mostly descriptive studies and one randomized trial, reporting it effective and safe apart from burning and pain¹. An open pilot study of a papain-containing retinoid gel in acne reported fewer lesions with mild local irritation². In a 2020 randomized placebo-controlled trial of a papain, Pycnogenol, and aloe vera combination in pre-diabetes, glycemic markers did not differ from placebo, and no trial has tested papain alone. Products listing papain are mainly capsules, tablets, and powders, often paired with bromelain; see Form comparison.

Allergy is the most consequential caution: papain sensitization is immunoglobulin E (IgE)-mediated and cross-reacts with chymopapain and with kiwi and fig. Health Canada labels ask for a practitioner's advice before use with anticoagulants, anti-inflammatories, gastrointestinal ulcer, pregnancy, or planned surgery⁴.

Last updated October 17, 2026. Read how we make monographs.

In the full monograph

23 sources, 15 studies

When to useThe situations practitioners use it for, each with the reason and the study behind it.
SafetyWho should avoid it, who needs extra care, and the side effects reported in studies.
InteractionsThe medicines and supplements it interacts with, the effect of each, and what labeling says to watch.
Protocol notesThe doses used in studies, how and when they were taken, and how the forms on the market compare.
How it worksWhat it is and how it works in the body, in plain terms.
Published studiesThe studies behind each use, popular claims checked against them, and trials still under way.
Word of mouthWhat patients and practitioners report online, kept separate from the clinical evidence.
Clinical perspectiveA closing read of where the evidence is solid, where it is thin, and what has not been studied.

Snapshot

In the full monograph

Sources