FAT LOSSSAFETY CONCERN
Synephrine (Bitter Orange)
Ephedrine-lite. Modest fat-loss signal, real cardiovascular risk when stacked.
EFFECTIVE DOSE
N/A — risk profile doesn't justify use
HOW IT WORKS
Beta-adrenergic agonist; increases resting metabolic rate slightly.
WHAT THE EVIDENCE SUPPORTS
- Minor thermogenic effect in isolation
WHAT TO LOOK OUT FOR
- Stacked with caffeine (as it usually is) → dangerous blood pressure and heart-rate spikes.
- Frequent in 'fat burner' blends alongside yohimbine — a red-flag combo.
SIDE EFFECTS
- Hypertension, arrhythmia, anxiety
SOURCES
Reviewed 11/1/2025 · Brawn Supplement Reviewer
Educational content. Not medical advice. Talk to a licensed professional before starting any supplement, especially if you take medications or have a medical condition.