Increased nitric oxide production from the amino acid L-arginine improves blood flow by relaxing blood vessels. A rise in blood flow to the penis has been linked to improved erection strength and a reduction in erectile dysfunction. Consider the following [Example:] This is exemplified by the following: As an example: [ Testosterone Levels, Cortisol Levels, Erectile Dysfunction, Normal Blood Sugar Level, Nitric Oxide, Bodily Functions, Reducing Cortisol Levels, Increase Testosterone, Reducing Blood Pressure