Ergocalciferol (Vitamin D2)
Ergocalciferol (Vitamin D2) is a tier 2 form of Vitamin D, used in 7 on-market products .
7
on-market products
tier 2
quality tier
n/a
elemental fraction
Why this tier: FDA/label convention treats D2 as bioequivalent to D3, but pooled RCTs found D2 less effective at raising/maintaining serum 25(OH)D, especially with infrequent/bolus dosing; the gap narrows with daily dosing and is debated.
Source: Tripkovic L et al. 2012, PMID 22552031
Trend
Brands using this form
| Brand | Products |
|---|---|
| Source Naturals | 3 |
| California Gold Nutrition Ultamins | 2 |
| NOW | 1 |
| Nature's Truth | 1 |