Citrulline

Citrulline is commonly found in watermelon and is prized for its ability to boost nitric oxide, which relaxes blood vessels and improves circulation. It's used by athletes to improve endurance and by men seeking better erectile function. For product comparison, Citrulline should be checked by exact form, plant part or compound type, standardization, amount per serving, and whether it is listed as an active ingredient, other ingredient, or part of a blend.