Vitamin D2

Key Information

Compare different forms of Vitamin D2 by bioavailability, conversion rates, and active ingredient content:

Form	Tier	Steps	Vitamin D2 Activity (IU)	Bioavailability	Action
Vitamin D2 (Ergocalciferol)	Tier 2	1	—	Moderate bioavailability form. Reliable form that works well but requires 1-2 step conversions by the body. Good balance of cost and effectiveness.	View →

These are the standardized units used to compare different forms:

Unit: IU (activity)

Biological activity units

Example: 400mg Magnesium Citrate provides 64mg Elemental Magnesium (16%)