Reasons For Early Gray Hairs
One of the biggest lifestyle triggers is smoking. Dr. Dray notes that smoking increases oxidative stress in the body, which damages melanocytes—the cells responsible for producing melanin, the pigment that gives hair its color. Once these cells are damaged or depleted, hair grows in gray or white.
Beyond lifestyle habits, nutrient deficiencies are another major—and often overlooked—factor. “Premature graying can also come about as a result of a deficiency in a vitamin or a mineral,” Dr. Dray says. This is where things get interesting, because unlike genetics, deficiencies can sometimes be corrected.
The most notable deficiency linked to premature gray hair is vitamin B12. According to Dr. Dray, “B12 deficiency can cause graying of the hair as well as hyperpigmentation over your knuckles and your feet.” Vitamin B12 is essential for red blood cell production, nerve health, and DNA synthesis, all of which play a role in healthy hair follicle function and pigment production.
When the body lacks B12, hair follicles may not receive enough oxygen or nutrients, impairing melanin production. If the deficiency is identified early, Dr. Dray explains, “that’s a situation where it is possible—if you replace the missing nutrient—then yeah, the pigment may return.” This makes B12 one of the rare causes of gray hair that can potentially be reversed.
People at higher risk for vitamin B12 deficiency include vegetarians, vegans, older adults, and those with digestive conditions that affect nutrient absorption. Since B12 is naturally found in animal products like meat, fish, eggs, and dairy, individuals who limit or avoid these foods may need fortified foods or supplements. Dr. Dray emphasizes that supplementation should always be guided by a healthcare provider, especially since excessive intake isn’t necessary or helpful if levels are already normal.
The bottom line
That said, expectations should be realistic. “For most of us, once we start going gray, the only way to get rid of it is to dye it,” Dr. Dray says. Even if a deficiency is corrected, existing gray hairs may not always regain pigment, but addressing the issue can help prevent further premature graying.
The bottom line? While gray hair is a natural part of aging, noticing it early could be a sign to look deeper. If premature graying appears alongside symptoms like fatigue, numbness, or skin discoloration, it may be worth discussing vitamin B12 testing with your doctor. In some cases, restoring this essential nutrient could help protect your hair—and your overall health—before more pigment is lost.