Betulinic acid

PhytochemicalTriterpenoidBest with a meal

What is it

Betulinic acid is a pentacyclic triterpene found in the bark of birch trees and several other plants. It is studied for potential anti-cancer and anti-viral activity, mostly in preclinical settings.

Evidence for 1 use

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

Anti-cancer (preclinical)

Mixed Evidence

Strong activity in cell and animal models has not translated into demonstrated human clinical benefit.

How it works

Betulinic acid can induce apoptosis (programmed cell death) in certain tumor cell lines, an effect that has driven decades of laboratory research. Proposed mechanisms include direct mitochondrial effects, inhibition of topoisomerase, and modulation of NF-kB signaling. Despite extensive preclinical work, betulinic acid has poor water solubility and limited oral bioavailability, which has hindered translation into human medicine. No clinical drug containing betulinic acid has been approved.

Dosage

There is no established human dose. Supplements containing betulinic acid lack standardized dosing, and absorption is poor. Concentrated extract products vary substantially.

When and how to take it

No evidence-based timing recommendation exists. Fat-soluble compound; absorption may improve when taken with a fat-containing meal.

2 commercial forms

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

Birch bark extract (betulinic acid-containing)

A common source of betulinic acid in supplement products.

Poor water solubility limits oral absorption.

Isolated betulinic acid

Used in research-grade and some specialty supplements.

Bioavailability remains low without specialized formulation.

Safety

Human safety data are very limited. Animal studies generally suggest acceptable acute tolerability, but long-term human safety is not established.

Who should be cautious

Avoid in pregnancy and breastfeeding due to lack of safety data. People with cancer should not self-treat with betulinic acid and should discuss any supplement with their oncologist.

Interactions

Specific drug interactions are not well characterized due to lack of clinical research. Theoretical interactions with cytochrome P450-metabolized drugs cannot be ruled out.

Frequently asked questions

Is betulinic acid a cancer treatment?⌄

No. It has shown activity in laboratory models but has not been approved or shown to be effective in human cancer treatment.

Can I get betulinic acid from birch tea?⌄

Birch bark contains it, but extraction into water is poor. Concentrated supplements are the main source, though absorption is also limited.

References

Betulinic acid on Wikidata — Wikidata link

Betulinic acid (ChEBI:3087) — ChEBI link

Betulinic acid (PubChem CID 64971) — PubChem link

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

Research on Betulinic acid (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.