Calcium is an essential mineral with many roles in the human body; it is needed for healthy muscles, heart, and to help our blood clot. However, most of the calcium in our bodies is in our teeth and bones.
You would be hard-pressed looking for a more fundamental micro-nutrient for overall good health.
Vitamin D is fundamental for optimum health. It is a nutrient found naturally in some foods like fatty fish, cheese and egg yolks. This nutrient has many roles including maintaining strong bones, healthy muscles, robust immune system, and helping achieve restful sleep.