Vitamins & Minerals
Vitamin D2 vs Vitamin D3
Quick Answer
This guide explains the two common supplemental forms of vitamin D, label names, and what to compare.
By Everyday Solutions Exchange Editorial · Published Sep 2026 · Updated Sep 2026Reviewed by Everyday Solutions Exchange Editorial
This guide explains the two common supplemental forms of vitamin D, label names, and what to compare.
The two forms
Vitamin D2 is ergocalciferol. Vitamin D3 is cholecalciferol. Both forms contribute to vitamin D intake and can appear in fortified foods or supplements.
How labels show them
The Supplement Facts panel lists vitamin D in micrograms and International Units. The ingredient line or parenthetical text can identify whether the source is D2 or D3.
What to compare
Check the form, amount per serving, serving frequency, and the rest of the formula. Vitamin D needs differ based on diet, sun exposure, age, and health status.
What to check before you choose a product
Read the serving size, ingredient list, amount per serving when provided, directions, warnings, and storage information. Keep ingredient research separate from claims about a finished multi-ingredient product.
Sources & References
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