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Recalculate it from the IU-definition for VitA, but be sure the difference between

retinol (C20H30O) and β-carotene (C40H56), both can be taken to be Vitamin A!

By definition for Vitamin A:

1 IU vitamin A is the biological equivalent of 0.3 μg retinol, or of 0.6 μg β-carotene

Examples:

6 μg of dietary β-carotene is equivalent to 3⅓ IU of vitamin A and is equivalent to 3⅓ IU of vitamin A.

This same amount also supplies the equivalent of 1 μg of retinol (or 1 RE =Retinol Equivalent) and is also equivalent to 3⅓ IU of vitamin A.

So 5000 IU is 1500 μg retinol or 3000 μg β-carotene

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