Nutrition can be useful for hair loss when there is a proven deficiency in specific nutrients such as iron, zinc, biotin, vitamin D, or essential amino acids. In these cases, targeted supplementation or dietary changes can stop hair shedding or promote regrowth. This is especially true for diffuse hair loss (telogen effluvium) or in women with iron deficiency. However, evidence for supplements in genetic androgenetic alopecia is weak; many products are marketed with exaggerated claims. A blood test to identify actual deficiencies is advisable before supplementing. MyBody-X tests can provide clues but do not replace clinical diagnosis. Caution is needed with high doses: excess vitamin A or selenium can itself cause hair loss. In summary, nutrition is not a cure-all, but it is a valuable tool when deficiencies are confirmed.
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