Evidence supporting the use of: Vitamin B12 (methylcobalamin)
For the health condition: Hair (loss or thinning)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 1

Vitamin B12 (methylcobalamin) is used in the context of hair loss or thinning primarily because of its essential role in cell division, DNA synthesis, and red blood cell production. Deficiency in vitamin B12 can lead to a variety of symptoms, including anemia and, in rare cases, hair changes such as thinning or premature graying. However, direct scientific evidence supporting the use of B12 supplementation solely for hair loss or thinning in individuals without a deficiency is minimal.

Most available scientific literature indicates that B12 supplementation may only benefit hair health in people who have clinically diagnosed B12 deficiency. In these cases, correcting the deficiency can help resolve associated symptoms, including hair changes. There are no robust clinical trials demonstrating that B12 supplementation improves hair growth or prevents hair loss in individuals with normal B12 levels. Furthermore, hair loss is often multifactorial and may be related to genetics, hormones, stress, or other nutritional deficiencies.

In summary, while there is a clear scientific rationale for B12 supplementation in those who are deficient, evidence for its efficacy in treating hair loss or thinning in the general population is weak. Its use in this context is supported by scientific reasoning only in cases of deficiency, and the overall quality of evidence for its routine use in hair loss is rated as low.

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