Blackbrush

Botanical

What is it

Blackbrush refers to Acacia rigidula, a Texas and Mexico shrub. It has been marketed in weight loss and pre-workout supplements based on claims about its alkaloid content. The FDA has flagged some Acacia rigidula products for containing the synthetic stimulant BMPEA, not naturally found in the plant.

Evidence for 1 use

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

Weight loss and energy

Mixed Evidence

No credible human evidence supports Acacia rigidula or BMPEA-containing products for weight loss or performance. Adverse events are reported.

How it works

Acacia rigidula itself contains small amounts of phenethylamines and other alkaloids in highly variable concentrations. Marketing claims around "natural" stimulant activity, lipolysis, and appetite suppression have not been supported by rigorous clinical research on authentic plant material. Products labeled as A. rigidula have been repeatedly tested and found to contain BMPEA (beta-methylphenylethylamine), a synthetic amphetamine-like stimulant not produced by the plant. The FDA has issued warning letters to manufacturers.

Dosage

No safe or evidence-based dose exists. Products vary wildly in actual content of plant alkaloids and adulterants.

When and how to take it

Not applicable; avoid use.

1 commercial form

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

Acacia rigidula extract (often adulterated)

Marketed in pre-workout and weight loss products. Adulteration with synthetic stimulants is documented.

Not reliably characterized due to adulteration.

Safety

Acacia rigidula products have been linked to cardiovascular adverse events. The presence of BMPEA in many products is a major safety concern, as BMPEA carries amphetamine-like risks of hypertension, arrhythmia, and stroke.

Who should be cautious

Avoid in pregnancy, lactation, cardiovascular disease, hypertension, anxiety disorders, and in any person taking psychiatric or cardiovascular medications.

Interactions

Major interactions with MAOI medications, antidepressants, blood pressure medications, and other stimulants. Should be avoided.

Frequently asked questions

Is Acacia rigidula safe?⌄

Commercial products carry significant adulteration risk. The FDA has issued warnings about BMPEA in these products.

Does blackbrush help with weight loss?⌄

There is no credible evidence supporting weight loss claims from authentic plant material.

References

Blackbrush on Wikidata — Wikidata link

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

Research on Blackbrush (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.