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Taking a look at vitamin A
Taking a look at vitamin A

Bottles of multivitamins are a common sight on New Zealand pharmacy shelves. But what is the clinical evidence backing up their use? Each month, complementary medicine expert Shaun Holt takes a look at the science in his A to Z of Vitamins series.
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2. Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E and beta carotene for age-related cataract and vision loss: AREDS report no. 9. Arch Ophthalmol 2001;119(10)1439–52. Study correction in Arch Opththalmol 2008;126:1251.
3. Rodahl K, Moore T. The vitamin A content and toxicity of bear and seal liver. Biochemical J 1943;372):166–68.