Nutrition can influence hair health, but hair loss should not automatically be blamed on a vitamin or mineral deficiency. Common causes include androgenetic alopecia, telogen effluvium, thyroid disease, scalp conditions, recent illness, medication effects and nutritional problems. The most useful first step is identifying the likely cause rather than starting multiple supplements without testing.
For a broader overview of causes and treatment pathways, visit our hair loss page.
Iron and ferritin
Iron deficiency can be associated with diffuse shedding in some people, particularly when there is anaemia or low iron stores. Symptoms such as fatigue or breathlessness can have many causes and need proper evaluation. Iron supplements should not be taken long term without medical advice because excess iron can also be harmful.
Vitamin D
Low vitamin D levels have been reported alongside several hair-loss conditions, but this does not mean vitamin D supplementation will reverse every type of hair loss. Testing and replacement decisions should be based on the individual’s clinical picture.
Vitamin B12, folate and other B vitamins
B12 or folate deficiency can affect general health and may coexist with hair shedding. Biotin deficiency is uncommon in otherwise healthy adults, and high-dose biotin is not a proven universal hair-growth treatment. It can also interfere with certain blood tests, so unnecessary supplementation is best avoided.
Zinc
Zinc deficiency may contribute to hair changes in some patients, but the relationship is not as simple as assuming that hair loss means low zinc. Excessive zinc supplementation can create other nutrient imbalances, including copper deficiency.
Protein and overall calorie intake
Very restrictive diets, rapid weight loss and inadequate protein intake can trigger temporary diffuse shedding. In these cases, restoring balanced nutrition and addressing the reason for the restriction may help, although visible improvement can take time because hair growth cycles are slow.
Omega-3, vitamin A and vitamin C
These nutrients have important roles in general health, but taking extra amounts does not guarantee thicker hair. In fact, excessive vitamin A intake has been linked with hair shedding. A varied diet is usually preferable to high-dose supplementation unless a clinician has identified a specific deficiency.
When a hair transplant is—and is not—the answer
A hair transplant does not treat nutritional deficiency or every form of alopecia. It may be considered for selected patients with stable patterns of permanent follicle loss and a suitable donor area. If surgery is relevant after diagnosis, see our hair transplant information.
If you are experiencing persistent or sudden shedding, patchy loss, scalp symptoms or hair loss alongside other health changes, arrange an assessment rather than self-prescribing supplements. You can reach the clinic through the contact page.