TLDR People with chronic hair loss may have a higher chance of Vitamin B12 deficiency.
Between January 2015 and April 2018, a study was conducted involving 317 patients with Chronic Telogen Effluvium (CTE), a common cause of hair loss, and 327 healthy individuals. The average Vitamin B12 levels were statistically similar in both groups. However, Vitamin B12 deficiency was found in 38 (11.98%) of the patients and in 22 (6.72%) of the controls, a statistically significant difference. The study concluded that there might be a correlation between CTE and Vitamin B12 levels, as the deficiency rate was significantly higher in the patient group.
134 citations
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December 2018 in “Dermatology and Therapy” Some vitamins and minerals like vitamin D and iron can help with certain types of hair loss, but more research is needed for others.
August 2024 in “Journal of Cosmetic Dermatology” Telogen effluvium is linked to deficiencies in iron, vitamin B12, and thyroid function.
207 citations
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April 2006 in “Journal of The American Academy of Dermatology” Iron deficiency may be related to hair loss, but there's not enough evidence to recommend iron screening or supplements for all hair loss patients.
May 2024 in “Pakistan Journal of Health Sciences” Iron deficiency is linked to hair loss in CTE patients.
June 2025 in “International Journal of Science and Research (IJSR)” Low iron and vitamin D are common in young females with hair loss.
239 citations
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July 2002 in “Clinical and Experimental Dermatology” Low iron and L-lysine levels can cause hair loss in women, and increasing these nutrients can reduce hair shedding.