Written by: Ehsan Siddiqui
25 August 2025
Noticing strands in your comb every day? Maybe it's more than just your shampoo or pollution. Here are 5 deficiencies that can cause hair loss according to experts.
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Vitamin D is essential for the cycling of hair follicles. A lack of vitamin D can cause hair thinning because it is essential for the development of new hair follicles.
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A lack of iron has been reported as one of the most common reasons for hair loss. Iron promotes oxygen delivery to hair follicles; without it, hair becomes thin, brittle, and susceptible to shedding.
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Zinc is essential for the growth and repair of hair tissue. It also aids the oil glands surrounding the follicles. Zinc deficiency can make your hair weak and brittle, which increases hair loss.
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Vitamin B12 helps maintain healthy red blood cells, which transport oxygen to your hair follicles. Lack of vitamin B12 can cause thinning or hair loss and slow down hair growth.
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Biotin promotes the development of keratin, the protein that makes up the majority of your hair, skin, and nails. Lack of Biotin can cause hair thinning, loss, and slower growth.
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