Sun Food Energy Strontium Citrate Bone Health Formula 2 Daily Dietary Supplement Quality You Can Trust Discussion: Strontium is a naturally occurring mineral present in water and food 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.