HealthPost is New Zealand’s favourite online supplier of natural health, skincare and household products – delivering to Australia for over 20 years. Among their best sellers are Vitamin D supplements. Vitamin D is required by our bodies to regulate a number of important functions, much like a hormone. Vitamin D supplements usually contain Vitamin D3 (Cholecalciferol). Vitamin D is one of the fat soluble vitamins and in its bioactive form (1,25 D) is required by our bodies to regulate a number of important functions, much like a hormone. It is an essential factor in calcium absorption, maintaining normal blood levels of calcium and phosphorus, bone formation and strength, muscle integrity and immune function. It has a significant role in reducing inflammation. Most importantly, 1,25 D controls the development of many serious diseases by its proven role in inhibiting the conversion of healthy tissue to diseased tissue.