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Vitamin

Vitamin D2

Vitamin D2, or ergocalciferol, is the form of vitamin D made by fungi and yeast when they are exposed to UV light.

Also listed as Ergocalciferol

Essential HealthBone & JointFitnessImmune SupportStress & Mood

What it is studied for

The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.

Essential HealthModerateBNo linked study
Bone densityBone & JointSmallBNo linked study
Muscle RecoveryFitnessSmallCNo linked study
Immune SupportSmallCNo linked study
Mood SupportStress & MoodSmallCNo linked study
Every rating with its studiesGrouped by health goal, with the publications behind each rating

Why people take it

Essential Health21.7%
Immune Support20.4%
Energy16.1%
Bone & Joint12.7%
Cognition5.6%
Longevity4.1%

SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.

Sources

  1. SuppCo · Vitamin D2 nutrient profile