Which of the following is NOT a proven effect of L-arginine?

L-arginine is an amino acid that serves several important functions in the body, particularly related to vasodilation and nitric oxide production, which can impact blood flow and recovery. However, its role in enhancing memory performance is not well-established in scientific research.

The proven effects of L-arginine include its ability to support blood flow improvement by increasing nitric oxide levels, which helps relax blood vessels and improve circulation. This has implications for cardiovascular health and athletic performance. Additionally, there is some evidence that L-arginine can facilitate recovery following exercise by improving nutrient delivery to muscles and enhancing metabolic processes.

While some studies suggest that L-arginine may influence growth hormone release, this effect is less consistently documented compared to its impact on blood flow and recovery. Therefore, memory performance does not appear to be a significant or proven benefit of L-arginine supplementation, resulting in this choice being the correct one to identify as NOT a proven effect.