A comprehensive full-spectrum, high-absorption, fully-chelated calcium along with many other nutrients (including vitamin A, vitamin C, vitamin D3, vitamin K1, vitamin K2, vitamin B6, methyl folate, vitamin B12, magnesium, zinc, copper, manganese, potassium, and boron) that may be helpful in supporting healthy bones.  This formula is exceptional for those who want optimal nutrition, especially those who have bowel sensitivity to magnesium. ‡