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Vitamins · Ingredient profile
Vitamin D2
An alternative form of vitamin D
Vitamin D2, or ergocalciferol, contributes to the same essential vitamin D functions as D3.
The essentials
Functions & potential benefits
- Helps maintain vitamin D nutrition.
- Supports calcium absorption.
- Contributes to normal bone health.
Everyday nutrition
Where it comes from.
UV-exposed mushrooms and some fortified foods.
Read the NIH reference ↗Evidence, in perspective
Know the limits.
Both D2 and D3 raise vitamin D levels. D3 may raise levels higher and for longer; the appropriate choice depends on the person.
Read the NIH reference ↗Important considerations
Before choosing a supplement.
Do not combine high-dose D2 and D3 without medical advice. Excess vitamin D can cause harmful blood-calcium levels.
Read the NIH reference ↗Ingredient education—not a product claim. This describes the ingredient, not a verified Herbs To Discover formula. Supplement Facts, serving amounts, directions, certifications, and availability are not yet published. Source review date 2026-09-15. Read the NIH reference ↗ · Editorial approach.