According to our research partner NutritionFacts.org Vitamin D3, sourced from sunlight exposure, animal, and plant sources may be preferable to vitamin D2 sourced from fungi.
If you aren’t getting access to enough sunlight in northern climates, take up to 2000 IU of Vitamin D Daily, according the the nutritional research of Joel Fuhrman, M.D. Learn more about supplementing Vitamin D, here.