evidence: Supplements of vitamin D3 can be made by extracting cholesterol from lanolin derived from sheep wool, then subjecting it to a series of chemical reactions to yield 7-dehydrocholesterol. This is then irradiated to produce D3 (cholecalciferol). Supplements obtained from lanolin are not vegan-friendly; however, a D3 supplement extracted from lichen is vegan and vegetarian-friendly. [...] - Exposing our skin to sunlight - Butter - Cheese - Egg yolk - Liver - Oily fish (eg, mackerel, salmon, tuna) and fish oil - Vitamin D3 supplements made using lanolin from sheep’s wool - Vitamin D3 supplements made using lichen (vegan/vegetarian friendly) [...] Vitamin D3 has historically been made from lanolin extracted from sheep wool, but recently, a vegan/vegetarian form has become available. This version is extracted from lichen (a type of plant usually found on rocks, walls, or trees) and it is called Vitashine. This product is also sugar, wheat, gluten, and dairy-free.