Due to popular request, we have now added the first product in our new "Regenesis Collection". In the coming weeks, check back. We will also be adding the "Magnesium" and "Regenesis DA" products to this collection, also with no added calcium. The Regenesis product is the flagship product in this collection, so it was added first. The Regenesis product is actually the original prototype product. Later in the development cycle, calcium was added to the formula in a near 1:1 ratio with magnesium. In the body, Calcium and Magnesium need to be balanced near 1:1 for smooth and relaxed muscle control. People taking higher levels of magnesium (over approximately 300 mg of elemental magnesium), should strongly consider also supplementing with calcium. This is because it becomes progressively more difficult to obtain enough calcium from the diet to keep a 1:1 ratio as magnesium dosage is raised. This is true even for those on calcium rich diets. Vitamin K2-MK4 allows the body to properly metabolize calcium.