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Convert Vitamin A, D, and E units for FDA and CFIA nutrition and supplement labelling workflows.
This converter is designed for food, beverage, and supplement labelling workflows. It helps convert legacy IU values into modern label units such as mcg RAE, mcg vitamin D, and mg alpha-tocopherol. It is not intended for prescription dosing, injectable medications, insulin, hCG, or clinical treatment decisions.
Use this when you need modern Nutrition Facts or Supplement Facts units, when preparing FDA- or CFIA-compliant labels, and to verify units before generating a supplement label.
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Use this converter to translate legacy IU values for Vitamin A, Vitamin D, and Vitamin E into modern FDA/CFIA label units before creating Nutrition Facts or Supplement Facts panels.
What this IU converter does not cover
MenuSano’s IU converter is limited to nutrients commonly encountered in food and supplement labelling: Vitamin A, Vitamin D, and Vitamin E. It does not convert pharmaceutical or biologic products such as insulin, hCG, heparin, or injectable medications. Those products require product-specific medical guidance.
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Explore MenuSanoHow to use this IU converter?
What does “Label standard” mean?
FDA (US) / CFIA (Canada) reflect modern label units where applicable:
Legacy IU reference is included for older IU-based references (especially for Vitamin A). If you need IU for Vitamin A, switch to the Legacy IU reference.
From IU conversion to label creation
Already working with ingredient values? Take the next step and create a clean Supplement Facts label using MenuSano’s FDA-compliant supplement label generator.
FDA Supplement Label GeneratorIU is potency, not weight (why the form matters)
An International Unit (IU) measures potency (biological activity). That’s why 1 IU does not equal a fixed mass across different vitamins, and sometimes even differs by form. Learn more about nutrient unit conversions for accurate labels.
If you’re creating or updating a Supplement Facts label, you may need to convert older IU-based amounts into mcg or mg, depending on the nutrient and form (especially for Vitamin A and Vitamin E).
MenuSano helps food and supplement businesses generate compliant labels and nutrition analysis outputs. Check out this guide on how to create supplement facts labels.
Converting International Units (IU) to modern mass-based units such as micrograms (mcg) and milligrams (mg) is often one small but important step in the supplement development process. While many vitamin ingredients are still supplied and documented using IU values, modern Supplement Facts and Nutrition Facts labels increasingly require nutrients to be declared using standardized units that align with current regulatory requirements.
For supplement brands, food manufacturers, contract manufacturers, formulators, and regulatory teams, accurate nutrient conversion helps ensure that formulation data, nutrition analysis results, and final labels all use consistent values throughout the product development lifecycle.
Many vitamin ingredients are supplied with potency information expressed in International Units. This is particularly common for Vitamins A, D, and E, where IU has historically been used to represent biological activity rather than weight.
As products move from formulation and sourcing into nutrition analysis and label creation, these values often need to be converted into the units required for modern Supplement Facts and Nutrition Facts panels.
Common sources of IU values include:
Because these documents frequently serve as the foundation for nutrition calculations and regulatory submissions, accurate conversion is essential before label generation begins.
Nutrition analysis relies on consistent nutrient data. When nutrient values are supplied in different units, it becomes difficult to accurately calculate serving-level nutrient content, determine Daily Values, and prepare compliant labels.
For Vitamins A, D, and E, converting IU values into the appropriate mass-based units helps create a common foundation for nutrition analysis and labelling workflows.
Many supplement and food manufacturers standardize nutrient values early in the development process to ensure that:
Modern supplement labelling regulations require careful attention to nutrient units and declaration formats. Depending on the nutrient and jurisdiction, values may need to be presented as:
Using the correct units is important because the same IU value can represent different amounts depending on the vitamin form being used. This is why conversion factors vary between nutrients and why accurate calculations are essential when preparing compliant labels.
Before generating a Supplement Facts or Nutrition Facts panel, manufacturers typically verify nutrient units, serving-level calculations, and regulatory requirements to ensure that label declarations are accurate and consistent with current standards.
The conversion process is often part of a larger workflow that includes formulation development, nutrition analysis, label creation, and regulatory review.
A typical supplement labelling workflow may include:
While converting IU values is only one step in that process, it plays an important role in ensuring that nutrient declarations remain accurate from ingredient sourcing through final label approval.
Organizations that manage multiple products, formulations, or markets often use nutrition analysis and labelling software to centralize nutrient data, reduce manual calculations, and streamline compliance workflows.
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