Methyl synephrine

Tier 4 — risky / avoid · Cardiovascular · Arrhythmia

A potent synthetic stimulant found in some weight loss and pre-workout products that causes dangerous heart rhythm disturbances. More cardiotoxic than regular synephrine due to its enhanced ability to stimulate heart receptors. Multiple adverse cardiovascular events have been reported. Not a legitimate dietary ingredient by any regulatory standard.

Dose: AVOID — potent cardiovascular stimulant; causes arrhythmia and hypertensive crisis