The Reference Daily Intakes (RDI, formerly Recommended Dietary Requirements or RDA) serve as guides to ensure adequate nutrition. These usually exceed the levels required to prevent symptoms of deficiency by 2 standard deviations; the increased amounts are intended to compensate for any problems a person may have for absorption or bioavailability. The nutrients are divided into fat soluble vitamins, water soluble vitamins and minerals.
Fat Soluble Vitamins
Equivalents
vitamin A
1 µg retinol = 6 µg beta-carotene
vitamin D
1 µg cholecalciferol = 40 IU vitamin D
vitamin E
1 tocopherol equivalent = 1 mg d-alpha-tocopherol
vitamin K
Water Soluble Vitamins
Equivalents
ascorbic acid (vitamin C)
thiamin
riboflavin
niacin
60 mg tryptophan is ideally converted to 1 mg niacin
vitamin B6
folate
vitamin B12 (cobalamin)
Minerals
calcium
phosphorus
magnesium
iron
zinc
iodine
selenium
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