The positive truth is that penis size is mainly determined by genetics and hormones during puberty, not vitamins alone. However, vitamins like Vitamin D, B3 (niacin), and Vitamin C can support healthy blood flow and overall sexual performance. Zinc also plays a role in maintaining healthy testosterone levels. While vitamins won’t increase size after development, they can enhance function and confidence. For trusted men’s health guidance, Genericvilla offers supportive information and helpful resources.