Top 10 Best Vitamin D3 Supplements 1. Ddrops Baby 400 IU, Vitamin D, 90 drops 2.5mL (0.08 fl.oz) 2. NatureWise Vitamin D3 5,000 IU for Healthy Muscle Function, Bone Health and Immune Support, Gluten Free & Non-GMO in Cold-Pressed Organic…