Should I buy ergocalciferol or cholecalciferol?

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When you shop for vitamin D supplements, you will notice that some are labeled "ergocalciferol," or "vitamin D2." Others are labeled "cholecalciferol," or "vitamin D3." Many doctors believe that cholecalciferol is the better choice. However, some research suggests that both types of vitamin D supplements will increase blood levels of this important nutrient. If your doctor recommends vitamin D supplements, ask which one you should take: ergocalciferol or cholecalciferol.