Evidence supporting the use of: Iron
For the health condition: Hair (loss or thinning)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Iron is scientifically validated as an important factor in hair health, particularly in the context of hair loss or thinning due to iron deficiency. Numerous studies have established that iron deficiency, with or without anemia, is associated with several types of hair loss, including telogen effluvium (diffuse hair shedding) and, in some cases, female pattern hair loss. Iron plays a crucial role in DNA synthesis and cell proliferation, both of which are necessary for healthy hair follicle function.

Clinical guidelines and dermatological organizations recommend that individuals experiencing unexplained hair loss be screened for iron deficiency, especially women of childbearing age, vegetarians, or those with risk factors for low iron. Supplementation with iron, when deficiency is confirmed, often leads to improvement or resolution of hair shedding, although the effects may take several months to become apparent.

It is important to note that iron supplementation is only beneficial for hair loss when deficiency is present; excessive iron can be harmful. For individuals with normal iron stores, supplementation does not enhance hair growth. The scientific consensus is robust for iron-deficiency-related hair loss, earning it a relatively high evidence score.

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