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Vitamin A

Deficiency can decrease night vision and immune function. People can convert beta-carotene from fruits and vegetables to vitamin A, but this ability is reduced in as many as 27–45 percent of people, based on their genetics.

Tip: Unless you eat a lot of liver (a major source of preformed vitamin A) or orange- and green-colored produce, you may need a vitamin A supplement.

Daily dose: 2,500–10,000 IU preformed vitamin A (retinol or palmitate)

Try: Solgar Dry Vitamin A