False Calumba

BotanicalBest with a meal

What is it

False calumba (Coscinium fenestratum, sometimes called tree turmeric) is a Southeast Asian climbing shrub whose stem and bark contain berberine. It has been used in traditional medicine for digestion, fever, and as an antimicrobial.

Evidence for 1 use

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

Glucose / lipids (via berberine content)

Good Evidence

Berberine has reasonable evidence for modest improvements in glycemic control and lipids. Whole Coscinium evidence is weaker.

How it works

The active component is berberine, a yellow isoquinoline alkaloid with documented effects on glucose metabolism (activating AMPK), cholesterol, and antimicrobial activity. Whole-plant Coscinium has similar but less well-characterized effects than purified berberine. Wild Coscinium populations are threatened, raising sustainability concerns.

Dosage

No standardized dose for whole-plant Coscinium. Berberine itself is typically used at 500 mg taken 2-3 times daily.

When and how to take it

Take with meals to reduce GI effects and align with glucose-lowering effects on postprandial sugar.

1 commercial form

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

Stem / bark extract

Wild Coscinium is conservation-threatened; choose sustainably sourced berberine instead.

Berberine has low oral bioavailability; some formulations attempt to improve it.

Safety

Berberine commonly causes GI side effects (cramps, diarrhea, constipation). Limited modern toxicology of whole Coscinium. Sustainability concerns regarding wild harvesting.

Who should be cautious

Avoid in pregnancy and breastfeeding (berberine can cross placenta and increase neonatal jaundice). Caution with diabetes medications and many prescription drugs.

Interactions

Berberine inhibits CYP3A4 and P-glycoprotein, potentially affecting drug levels (cyclosporine, certain statins, midazolam, others). Additive effects with antidiabetic drugs may cause hypoglycemia.

Food sources

Not a food source

Amount
N/A
%DV
—

Frequently asked questions

Why is it called false calumba?⌄

True calumba (Jateorhiza palmata) is a different African plant. Coscinium fenestratum was used as a substitute, hence 'false calumba.'

References

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

Research on False Calumba (PubMed search) — PubMed link

Track False Calumba with Pilora

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

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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.