β-Methylphenethylamine (β-Me-PEA, BMPEA, or 1-amino-2-phenylpropane) is an organic compound of the phenethylamine class, and a positional isomer of the drug amphetamine, with which it shares some properties.

The β-methyl compound also had ~ 2 x the broncho-dilating power of amphetamine (as measured using the isolated rabbit lung), and an LD50 of 50 mg/kg (rat, i.v.).

[5] In 2012, however, the FDA determined that BMPEA was not naturally present in Acacia rigidula leaves.

[8][9] Despite US Food and Drug Administration warning letters, BMPEA remains present in dietary supplements.

The female victim with no medical history had taken a Swedish food supplement with 290 mg β-methylphenethylamine per serving before commencing her usual exercises.