Vitamin D plays an essential role in your body ability to strengthen your immune system and build strong bones. Most vitamin D sources are from animal sources like sheep's wool or duck feathers while TruWild's is from vegan natural sources of mushrooms and lichen. Paired with over 300mg of calcium from ocean rich minerals to aid in strong bones and increased healthy well-being BETTER THAN THE REST: The only Non-GMO verified, Vegan Certified, 100% Plant-Based capsule available.