Vasoconstriction and Nitric Oxide

Researchers from the Medical College of Georgia report that high glucose levels in diabetic patients can reduce the amount of a vasodilator called nitric oxide in the blood vessels. Over time, these reduced levels contribute to narrowing of the blood vessels, the researchers note.

Supplements containing beets, ginseng and amino acids such as L-citrulline MIGHT help with shrinkage by helping the body produce more nitric acid.

Ritalin Vasoconstriction.