The amino acid arginine gained popularity as a bodybuilding supplement, but research shows it may be best for one muscle in particular: the heart. Cells use arginine to make nitric oxide, which helps ...

L-arginine is an amino acid that may help promote blood flow, athletic performance, and wound healing, among other benefits. But taking L-arginine supplements may interact with certain medications.

Arginine, or L-arginine, is an amino acid that occurs in foods such as dairy, fish, poultry, and other meats. It is a building block of protein. The human body produces arginine, and children require ...