Royal Green Organic Vitamin D3 contains 25 mcg of vitamin D3 from lichen and is fully plant-based, certified organic, and suitable for vegans. This formula is free from fillers and provides a higher dose for those seeking extra support. The classic Vitamin D3 contains 7.5 mcg of vitamin D3 from lanolin (wool fat), in a compact tablet that is easy to dose for daily use. Looking for an organic, vegan, and potent option? The organic D3 is the right choice. If a lower dose in a convenient tablet is sufficient, the classic D3 perfectly meets your needs.