Your skin Makes vitamin D3 via exposure to direct sunlight. Plants get their nourishment from the sun as well, which inspired us to create a vitamin D3 supplement that is of Animal sources or byproducts: not in the 100% vegan capsule, nor in the nutrient inside. For vegans and vegetarians, getting the right nutrition can pose unique challenges. So we created a vegan-dly 125 mcg vitamin D3 formula.