Can a deficiency in certain vitamins cause hair loss?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Yes, vitamin deficiencies can cause hair loss. Low levels of vitamin D, iron, biotin (B7), zinc, and vitamin B12 are commonly linked to thinning hair and increased shedding. These nutrients support the hair growth cycle, follicle health, and oxygen delivery to the scalp. Correcting deficiencies through diet or supplements often helps restore hair growth.

Because hair loss can stem from many causes—not just nutrition—identifying the root issue is key to effective treatment. Take a free, instant, online symptom check to better understand what may be driving your hair loss and get personalized guidance on your next steps.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Learn if hair loss needs medical care Discover likely causes of your hair loss See whether vitamin deficiency explains hair loss Find OTC options for thinning hair Find a doctor for hair loss Understand home remedies for hair loss Check if hair loss needs urgent care

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Explanation

Hair loss can sometimes be caused by not having enough of certain vitamins and minerals in the body.

Vitamin D and Iron: According to research, low levels of vitamin D and iron (measured as serum ferritin) can be linked to hair loss, especially in women.
Other Vitamins: Other vitamins and minerals like zinc, biotin, and vitamin A may also play a role in keeping hair healthy, but more studies are needed to know for sure.

If you think you might be losing hair because of a vitamin deficiency, it could be helpful to use a free symptom checker to explore possible causes and talk to a healthcare provider. They can help find out if a vitamin deficiency is the cause and suggest ways to improve your diet or take supplements if needed.

(References)

Almohanna HM, Ahmed AA, Tsatalis JP, & Tosti A. (2019). The Role of Vitamins and Minerals in Hair Loss: A Review. Dermatology and therapy, 30547302.
Rushton DH. (2002). Nutritional factors and hair loss. Clinical and experimental dermatology, 12190640.
Rasheed H, Mahgoub D, Hegazy R, El-Komy M, Abdel Hay R, Hamid MA, & Hamdy E. (2013). Serum ferritin and vitamin d in female hair loss. Skin pharmacology and physiology, 23428658.

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