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Assuming you mean international units for vitamins this question can only be answered for the specific vitamin. Vitamin units are measured by their potency and not by weight.

vitamin A for instance:

  • 1 IU retinol = 0.3 mcg RAE
  • 1 IU beta-carotene from dietary supplements = 0.15 mcg RAE
  • 1 IU beta-carotene from food = 0.05 mcg RAE
  • 1 IU alpha-carotene or beta-cryptoxanthin = 0.025 mcg RAE

as you can see different sources of the same vitamin can have different IU to weight ratios for RAE (retinol activity equivalent)

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