With 50 mcg K2 and MK-7 & 600 IU Vitamin D3. 2 Daily. Strontium is a naturally occurring mineral intended to provide nutritive support for normal, healthy bone density and strength and has been studied for its potential to support the formation and function of osteoblasts. Vitamin D is an essential fat-soluble nutrient intended to provide nutritive support for healthy bones and teeth. K2 is intended to provide nutritive support for healthy bones and a healthy cardiovascular system. Studies suggest that menaquinones such as MK-7 are more effective in supporting arterial health than K1. The MK-7 form of vitamin K2 is thought to be more completely absorbed and remain in the body longer than other forms of vitamin K.