Charantin

PhytochemicalSteroidal saponinBest with a meal

What is it

Charantin is a steroidal saponin mixture (mainly sitosteryl glucoside and stigmasteryl glucoside) extracted from bitter melon (Momordica charantia). It is the most-studied compound from bitter melon and is marketed for blood sugar support.

Evidence for 1 use

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

Type 2 diabetes / blood glucose

Limited Evidence

Small randomized trials of bitter melon (standardized to charantin) show modest reductions in fasting glucose and HbA1c. Effects are smaller than from prescription antidiabetic drugs.

How it works

Charantin has been shown in laboratory and animal studies to lower blood glucose, potentially through several mechanisms: stimulating insulin release from pancreatic beta cells, improving peripheral glucose uptake, and inhibiting gluconeogenesis in the liver. In human studies, bitter melon extracts standardized to charantin have produced small reductions in fasting blood glucose and HbA1c in people with type 2 diabetes, but effect sizes are typically smaller than those from established medications. Variability between products is substantial.

Dosage

No standardized dose. Bitter melon extracts are typically dosed at 500-2000 mg daily, often standardized to 2.5-5% charantin. Pure charantin doses are not well established.

When and how to take it

Take with meals, ideally with carbohydrate-containing meals, to support post-prandial glucose. Daily consistency matters. If you take diabetes medication, check blood sugar regularly.

1 commercial form

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

Bitter melon extract standardized to charantin

Most common commercial form; standardization varies.

Saponin glucosides absorbed in small intestine.

Safety

Generally well tolerated. Side effects include mild gastrointestinal upset (nausea, abdominal cramps, diarrhea). Bitter melon seeds contain a different compound (vicine) that can cause hemolytic reactions in people with G6PD deficiency.

Who should be cautious

Use caution if taking diabetes medications - hypoglycemia risk. Avoid in pregnancy (potential uterine-stimulating effects from bitter melon). Avoid in G6PD deficiency. Stop before surgery to avoid blood-sugar swings.

Interactions

May add to the effect of insulin and oral diabetes medications, increasing risk of hypoglycemia. Monitor blood glucose closely if combining.

Food sources

Bitter melon (karela), cooked

Amount
1/2 cup (~70 g)
%DV
—

Frequently asked questions

Is charantin the same as bitter melon?⌄

Charantin is one of several active compounds in bitter melon. Bitter melon itself contains other compounds that may also affect blood sugar, including polypeptide-p and vicine.

Can I replace my diabetes medication with charantin?⌄

No. The blood sugar effects of charantin or bitter melon are modest compared to prescription medications. Work with your clinician on any treatment changes.

References

Charantin on Wikidata — Wikidata link

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

Research on Charantin (PubMed search) — PubMed link

Track Charantin with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store
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.