L-arginine capsules contain the amino acid L-arginine, which plays diverse roles in bodily functions. As a precursor to nitric oxide, L-arginine supports cardiovascular health by promoting blood vessel dilation, potentially improving circulation and lowering blood pressure. Athletes often use L-arginine supplements to enhance exercise performance, as increased blood flow may deliver more oxygen and nutrients to muscles, aiding endurance and recovery. Additionally, L-arginine’s role in nitric oxide production can benefit men with erectile dysfunction by relaxing blood vessels in the penis, facilitating increased blood flow. Some research suggests L-arginine may also aid wound healing, particularly in individuals with conditions like diabetes, due to its involvement in collagen production.