Which of the following is a normal function of L-arginine?

L-arginine is an amino acid that plays several critical roles in the body, one of which is aiding in protein synthesis. It serves as a precursor to several important molecules, including nitric oxide, which is crucial for various physiological functions like vasodilation and improving blood flow. When the body synthesizes proteins, L-arginine helps with the overall process, contributing to muscle growth and repair, hormone release, and various metabolic activities.

In contrast, increasing body fat storage, decreasing oxygen delivery to tissues, and inhibiting immune function are not normal functions of L-arginine. Instead, this amino acid is associated with supporting metabolic processes and promoting a healthy immune response. Its role in enhancing circulation through improved nitric oxide production also indirectly supports oxygen delivery, making it beneficial rather than detrimental to tissue oxygenation.