GreenLife Vitamin D3 1000 IU supports bone and heart health and enhances immune system. It is used to maintain vitamin D3 levels in the body. Vitamin D3 support bone health by promoting calcium homeostasis. It may also lower the risk of thickening of arterial walls and arterial calcification or atherosclerosis of the arteries. It also supports proper regulation over protection of specific proteins that support healthy immune function. Good dietary supplement produced from New Zealand