L-Arginine is a naturally occurring amino acid vital for a variety of biochemical reactions in our bodies, and is most notably a precursor of Nitric Oxide. L-Arginine is involved in cell division, immune and cardiovascular functions, and the release of growth hormone, insulin, and other substances. L-Arginine plays an important role in our body's protein metabolism and is therefore essential to a healthy diet.

Natrol L-Arginine:
- Supports muscle protein synthesis,
- Enhances sexual responsiveness,
- Supports the health of your blood vessels and circulation,
- Supports vasodilation to enhance blood flow,
- Maintain heart health.

It is also popular among bodybuilder and fitness enthusiast as recent clinical studies show evidence that it can:
- Build lean muscle,
- Boost HGH production,
- Preserve bone density.