Gray hair after 60 is usually a normal part of aging. Still, when silver strands appear faster than expected—or arrive alongside fatigue, weakness, numbness, or other changes—it can be reasonable to look beyond cosmetics and consider nutrition as part of the picture. One nutrient that often enters this discussion is vitamin B12 . B12 is essential for red blood cell formation, nerve function, DNA synthesis, and several other processes that help the body work normally. A true deficiency can affect many tissues, including the skin and hair. That does not mean taking extra B12 will automatically turn gray hair dark again. The more useful question is this: Could a real B12 deficiency be contributing to broader changes in hair and health—and would correcting that deficiency help? Why Hair Turns Gray With Age Hair color depends largely on melanin, the pigment produced by specialized cells in the hair follicle. As we age, those pigment-producing cells gradually become less active. Genetic...