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

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Synopsis

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

Vitamin A is sometimes used to support or treat hair loss or thinning, primarily based on its established role in cellular growth and differentiation, including the cells that make up hair follicles. Scientifically, Vitamin A is essential for normal cell function and sebum production in the scalp, which theoretically could help maintain a healthy environment for hair growth. However, there is limited direct clinical evidence to support the use of Vitamin A supplements specifically for treating hair loss or thinning in humans. Most evidence comes from animal studies or indirect observations. For example, severe Vitamin A deficiency can lead to dry hair and other skin/hair problems, but this is rare in developed countries. Conversely, excessive intake of Vitamin A is well-documented to cause hair loss (telogen effluvium) as a toxicity symptom. No high-quality randomized controlled trials have demonstrated that supplementation with Vitamin A improves hair growth in people with normal Vitamin A levels. Thus, while Vitamin A is essential for general health, its supplementation is not broadly recommended for hair loss unless a deficiency is diagnosed. Traditional or folk uses are not prominent, and modern scientific evidence for its supplementation in hair loss is weak, meriting a low evidence rating.

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