Evidence supporting the use of: Vitamin C (not specified)
For the health condition: Hair (loss or thinning)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Vitamin C is sometimes used to support hair health, including addressing hair loss or thinning. The justification for its use is primarily scientific, but the evidence is limited. Vitamin C is an essential nutrient involved in collagen synthesis, which is a key component of the hair structure. It also functions as an antioxidant, protecting hair follicles from oxidative stress, which can contribute to hair aging and loss. Vitamin C may indirectly support hair growth by improving iron absorption; iron deficiency is a known cause of hair loss, especially in women. However, there is a lack of high-quality clinical trials directly linking vitamin C supplementation to significant improvements in hair loss or thinning in individuals without vitamin C deficiency. Most scientific support comes from understanding vitamin C's biological roles rather than direct intervention studies. A deficiency in vitamin C (scurvy) can lead to hair abnormalities, but such deficiency is rare in developed countries. In summary, while vitamin C is important for overall hair health and may play a supportive role, there is only modest scientific evidence for its use as a treatment for hair loss or thinning in otherwise healthy individuals.

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