This supplement is intended to support bone health. When you take the BioTE ADK supplement, many biological systems throughout the body are impacted. Vitamin A is a powerful antioxidant which may help support immune health. Vitamin D is reported to lower cholesterol and may improve absorption of calcium. Vitamin K is known for helping with blood circulation. The combination of these vitamins can have a hormone stabilization effect that in tandem with bio-identical hormone replacement pellet therapy can be lifechanging.