PERFORMANCELIMITED
L-Arginine
Poor oral bioavailability. Citrulline does its job better.
EFFECTIVE DOSE
N/A for reliable NO effect — citrulline is the better route
HOW IT WORKS
NO precursor, but heavily metabolized in the gut before it reaches circulation.
WHAT THE EVIDENCE SUPPORTS
- Marginal in resistance training
WHAT TO LOOK OUT FOR
- If a product touts 'NO boost' with arginine as the star, look for citrulline instead.
SIDE EFFECTS
- GI upset at high doses
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.