While vitamins cannot guarantee longer-lasting performance, certain ones can support sexual health. Folic acid supplementation has shown improvements in erectile function. Vitamin B12 is essential for the production of red blood cells and normal neurologic function. Vitamin B3 (niacin) is necessary to prevent pellagra and can potentially improve erectile function. Vitamin E is an antioxidant that may increase blood flow and oxygenation to the penis. Vitamin D is crucial for the formation of sperm cells and the production of testosterone.