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mcg to IU Converter

Convert mcg to IU and IU to mcg for vitamin D, vitamin A retinol, and natural or synthetic vitamin E. Includes label warnings because IU is substance specific.

Use the number from the label before converting it.

IU is not a universal vitamin unit.

Match the preset to the exact nutrient form on the label before you convert. Vitamin D, vitamin A retinol, and vitamin E do not share one factor.

For vitamin E, natural and synthetic forms convert differently. If your label shows beta-carotene, mcg RAE, or mg alpha-tocopherol, do not use the wrong preset as a shortcut.

This converter provides educational unit arithmetic and is not medical, pharmacy, nutrition, or dosing advice. Do not start, stop, combine, or change a vitamin, supplement, or medication based on this result. Confirm the exact substance, chemical form, original unit, serving size, and instructions on the current product label. Ask a pharmacist or qualified healthcare professional about personal use, pregnancy, children, high doses, medical conditions, interactions, prescriptions, or any label that is unclear. For a possible overdose or adverse reaction, contact local emergency or poison-control services promptly.

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