Vegan Vitamin D3 Vitamin D3 is offered here in its purest form. It is extracted from lichen and is therefore free of animal sources. The vitamin D3 is also encased in a plant-based cellulose capsule. Vitamin D helps maintain muscle function and the immune system. It also promotes the absorption of calcium and phosphorus. Furthermore, vitamin D can support bone and teeth health. Vegan, without artificial colors, flavors, or sweeteners. Gluten-free and lactose-free.