Nature's Way Adult Vita Gummies Vitamin D 200 Gummies Exclusive SizeNature's Way Adult Vita Gummies Vitamin D3 1000IU supports bone strength & healthy immune system function. Nature's Way Adult Vita Gummies Vitamin D3 1000IU provides a daily does of 1000IU of Vitamin D3 to support immune system function, and support bone health. Low levels of vitamin D3 can occur from lack of exposure to the sun or darker skin. Vitamin D3 is important as it supports: Bone health and strength Dietary calcium absorption Healthy strong