Amazon.com: Vitamatic Vitamin D3 50,000 IU (as Cholecalciferol), Once Weekly Dose, 1250 mcg, 60 Veggie Capsules 1 Year Supply, Progressive Formula Helping Vitamin D Deficiencies (60 Count (Pack of 1)) : Health & Household
PDF) Vitamin D-3 Is More Potent Than Vitamin D-2 in Humans