Nature's Life Strontium Plus D3 & K2 features strontium, a naturally occurring mineral intended to provide nutritive support for normal, healthy bone density and strength. Vitamin D is an essential fat-soluble nutrient that promotes healthy bones and teeth. K2 is intended to provide nutritive support for healthy bones and cardiovascular support. 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. Free of milk, eggs, peanuts, tree nuts, fish, shellfish, soy and wheat.