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Vitamin A
Vitamin A and iron deficiency:
According to researchers that conducted a systematic review of studies about the relationship of vitamin supplementation to anemia, vitamin A was found to improve blood indicators and the effectiveness of iron supplementation (4). Vitamin A has also been known to make iron supplements more effective (5).
Vitamin A and retinitis pigmentosa:
Researchers conducted a randomized, controlled, double-blind trial to determine whether vitamin A or vitamin E, alone or in combination, would stop or slow the progression of retinitis pigmentosa, an eye disease in which there is damage to the retina. A total of 601 patients aged 18-49 years old over where assigned to either 15,000 IU/d of vitamin A, 15,000 IU/d of vitamin A plus 400 IU/d of vitamin E, trace amounts of both vitamins, or 400 IU/d of vitamin E. Findings show that those receiving 15,000 IU/d of vitamin A had on average a slower rate of decline of retinal function than the two groups not receiving this dosage. However, 400 IU/d of vitamin E had a negative impact on the progression of retinitis pigmentosa. (5)
