ubstance is officially abandoned in favor of a newly established mass. The unit count will often still remain in use.
- Vitamin A: 1 IU is the biological equivalent of 0.3 μg retinol, or of 0.6 μg beta-carotene.[6][7][a]
- Vitamin C: 1 IU is 50 μg L-ascorbic acid
- Vitamin D: The biological activity of 40 IU is equal to 1 μg [8]
- Vitamin E: 1 IU is the biological equivalent of about 0.667 mg d-alpha-tocopherol (2/3 mg exactly), or of 0.45 mg of dl-alpha-tocopherol.[9][10]
- Insulin: 1 IU is equivalent to 0.0347 mg of human insulin (28.8 IU/mg).
- Oxytocin: 1 IU is equivalent to 2 μg of pure peptide.
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