Research review
Papaya enzyme: what the research does and doesn't show
No papain, papaya leaf extract or papaya seed product has been shown to treat constipation, bloating, reflux or any digestive symptom in a general population, and none has an established safe dose in pregnancy or for children. One small trial of a specific liquid papaya preparation found improvement in constipation and bloating, with real design limits covered here.
The evidence doesn't support papain, papaya leaf extract or papaya seed material as a treatment for constipation, bloating, acid reflux or any other digestive symptom, and safe use in pregnancy hasn't been established at a concentrated supplement dose. One small trial of a specific liquid papaya preparation found improvement in constipation and bloating, but its design has real limits, covered below.
What the evidence doesn't support
It doesn't support papaya enzyme products as a treatment for constipation, bloating, acid reflux, nausea, gas or any digestive condition in a general population, and it doesn't support any papain, leaf extract or seed product as established safe during pregnancy or for children — see who should not take papaya enzyme for the full detail on both. Ripe papaya as a food and a concentrated papain or leaf-extract supplement are different questions; nothing here should be read as advice about eating papaya as a fruit.
What the trials found
A 2013 double-blind, placebo-controlled trial in Neuroendocrinology Letters gave adult volunteers with chronic, ongoing digestive complaints 20 mL daily of a specific fermented papaya preparation (Caricol) or placebo for 40 days, tracking the frequency of 22 symptoms by questionnaire. In participants who completed and returned within two days of finishing ("early returnees"), the preparation produced a statistically significant improvement in constipation and bloating; heartburn improvement fell short of statistical significance, in part because only 13 participants reported that symptom. None of the improvements held up in participants who returned late, after a longer washout period — an unusual split in the data that limits how much weight to put on the result. This trial used a specific commercial papaya preparation at a stated liquid dose, not papain, leaf extract or seed material in general, and hasn't been repeated in a larger or independent trial.
On pregnancy specifically: a rat study found ripe papaya juice, fed throughout gestation or tested directly on uterine tissue, caused no measurable pregnancy or uterine effect and no fetal or maternal toxicity. The same study, and a second lab study, found that concentrated papaya latex — the raw material papain is made from — produced strong, oxytocin-like contractions when tested on isolated uterine tissue, strongest in late pregnancy. Neither is a human clinical trial, and neither tested a typical oral supplement dose in pregnant people, but the pattern is consistent enough across animal and lab research that no dose of papain, papaya leaf extract or papaya seed material has been established as safe in pregnancy.
No controlled human trial was found testing papain, papaya leaf extract or papaya seed material for causing or resolving diarrhea, or for nausea specifically. Digestive upset is commonly reported anecdotally with enzyme-containing supplements generally, but no study establishes a rate for these products specifically — see papaya enzyme side effects.
Questions people ask
Can I take papaya enzyme while pregnant?
No dose of papain, papaya leaf extract or papaya seed material has been established as safe during pregnancy. Lab research found concentrated papaya latex — what papain is made from — causes strong uterine contractions in isolated tissue, strongest in late pregnancy. Ask a doctor before using any papaya-derived supplement if you're pregnant or trying to become pregnant. This is a different question from eating ripe papaya as a food, which the same research found caused no measurable effect in a rat study.
Is papaya enzyme safe during pregnancy?
See above — it hasn't been established as safe at a concentrated supplement dose, based on animal and lab evidence on papaya latex and uterine tissue, even though no human trial has tested it directly. Ask a doctor first.
Is a papaya enzyme peel safe during pregnancy?
A papaya enzyme skincare peel is a topical exfoliant, a completely different product from an oral papain, leaf extract or seed supplement, with its own separate use and safety considerations. This page covers the oral supplement; ask a dermatologist or your doctor about a topical peel specifically.
Does papaya enzyme help with constipation?
One small trial of a specific fermented papaya preparation found a significant improvement in constipation in part of its sample, but the same trial's benefits didn't hold up in participants who returned after a longer gap, and it hasn't been independently repeated. That's a reason for caution about the result, not a demonstrated treatment.
Does papaya enzyme help with bloating?
The same trial found a significant improvement in bloating in part of its sample, with the same limits described above — an unusual study design and no independent replication.
Does papaya enzyme help with acid reflux or heartburn?
The trial above found heartburn improvement that fell short of statistical significance, in a small subgroup. See papaya enzyme and GERD or IBS for what's been tested for diagnosed reflux disease specifically, which is a separate and thinner research question.
Does papaya enzyme help with digestion in general?
No controlled human trial was found testing oral papain by itself, at a stated dose, for any digestive outcome. The one relevant trial tested a specific liquid papaya preparation, not papain, leaf extract or seed material broadly — see papaya enzyme benefits: what the research does and doesn't show.
Can papaya enzyme cause diarrhea or constipation?
No controlled trial was found establishing either as a caused side effect. Chewable products commonly include a sugar alcohol, which carries its own separate, label-disclosed laxative-effect consideration apart from the papaya ingredient itself.
Will papaya enzyme help with gas?
No trial specifically measured gas as an outcome. It falls under the same bloating research described above, with the same limits.
Are there chewable papaya enzyme tablets suitable for children?
No dose of papain, papaya leaf extract or papaya seed material has been established for children as a general supplement, in any format. See who should not take papaya enzyme and ask a pediatrician first.
When to talk to a doctor
Persistent constipation, bloating, reflux, diarrhea or nausea are worth raising with a doctor rather than working through with a supplement search, especially if a symptom is new, severe or doesn't resolve. Papaya enzyme products are not a treatment for a digestive condition, and pregnant or breastfeeding people, and anyone considering a papaya-derived product for a child, should talk to a doctor first rather than rely on the research above, which is animal, lab or small-trial evidence, not a clinical safety study in people.
Related reading: papaya enzyme and GERD or IBS: what the research shows, papaya enzyme benefits: what the research does and doesn't show, and who should not take papaya enzyme.
Sources
- Papaya preparation (Caricol®) in digestive disorders A small placebo-controlled trial of a specific fermented papaya liquid preparation found significant improvement in constipation and bloating in part of its sample after 40 days, but the benefit disappeared in participants assessed after a longer gap, and heartburn improvement wasn't statistically significant — an unusual split-sample design that limits confidence in the result.
- Papaya (Carica papaya) consumption is unsafe in pregnancy: fact or fable? Scientific evaluation of a common belief in some parts of Asia using a rat model A rat study found that ripe papaya juice, fed throughout pregnancy or applied to uterine tissue, caused no measurable pregnancy or uterine effect, while concentrated papaya latex — the raw material papain is made from — caused strong, oxytocin-like uterine contractions in the same kind of isolated-tissue test.
- Effect of papaya latex extract on gravid and non-gravid rat uterine preparations in vitro A lab study on isolated rat uterine tissue found that papaya latex extract — and, separately, pure papain itself — can trigger uterine muscle contractions, strongest in late pregnancy, acting mainly through the same receptor pathway as adrenaline-type signaling.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.