Australian NaturalCare Vitamin D3 1000IU helps to build and maintain healthy bones and assists calcium absorption. It was once assumed that Vitamin D deficiency wasn't an issue in sunny Australia because Vitamin D is largely produced via the action of sunlight on the skin. In more recent years it has become apparent that up to 1 in 4 Australians have sub-optimal levels of this nutrient. Vitamin D helps calcium absorption and supports bone mineralisation and helps to maintain bone strength. It also supports healthy immune function. People with insufficient Vitamin D levels may experience health concerns such as osteoporosis, increased hair loss, muscle weakness, and reduced immune function.