Evidence supporting the use of: Vitamin A (retinol)
For the health condition: Eyes (red or itching)

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Synopsis

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

Vitamin A (retinol) is scientifically validated as essential for maintaining eye health. Its role in vision is well-established, particularly in the formation of rhodopsin, a pigment in the retina that is necessary for low-light (scotopic) vision. Vitamin A deficiency is known to cause a range of ocular problems, including night blindness, xerophthalmia (dry eyes), conjunctival and corneal xerosis, and in severe cases, complete blindness. These conditions can manifest as redness, dryness, and itching of the eyes. Supplementation with vitamin A can reverse these symptoms when they are due to deficiency, which is most commonly seen in malnourished populations, children, and certain patient groups with malabsorption disorders. However, it is important to note that while vitamin A is effective in treating ocular symptoms related to deficiency, there is limited evidence supporting its use for red or itching eyes in individuals with normal vitamin A status or in cases where symptoms are due to other causes such as allergies or infection. Over-supplementation can be toxic and is not recommended without diagnosed deficiency. Clinical guidelines, including those from the World Health Organization, recommend vitamin A supplementation primarily for prevention and treatment of deficiency-related ocular diseases, not for general eye irritation or redness unrelated to deficiency.

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