Evidence supporting the use of: Iron
For the body system: Hair

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Synopsis

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

Iron is scientifically validated as an important nutrient for supporting the health of the hair and, by extension, the hair body system. Iron deficiency is a well-established cause of hair loss, particularly in the form of telogen effluvium, a condition where hair falls out after a stressful event or nutritional deficiency. Numerous clinical studies have demonstrated that individuals with low iron stores—especially premenopausal women—are more likely to experience diffuse hair thinning. Iron’s primary role is in the formation of hemoglobin, which carries oxygen to cells, including the cells of the hair follicle. Adequate oxygenation is crucial for normal hair growth and follicle cycling.

Several reviews and meta-analyses have found a correlation between low serum ferritin (a marker for iron stores) and chronic hair loss. Supplementation with iron has been shown to improve hair growth in those who are iron-deficient. However, evidence does not support iron supplementation for hair health in individuals who already have normal iron levels, and excess iron can have adverse effects. Thus, the use of iron to support the hair body system is justified by strong scientific evidence, but primarily when there is an underlying deficiency.

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