Well-studied — a semi-essential amino acid the body converts toward nitric oxide.
L-arginine is an amino acid your body uses to produce nitric oxide, a molecule that helps blood vessels relax and supports healthy circulation.
Of JellyBoost's five ingredients, L-arginine has one of the stronger research bases in the male-performance category. It's found naturally in foods like meat, dairy and nuts.
We rate the evidence for L-arginine as well-studied — among the better-researched ingredients in this category, though individual response still varies.