Our unique formula combines the new recommended maintenance dose of 2000 IU of Vitamin D as reported at the 2007 NIH conference. Current research indicates that Calcium in the citrate/malate form is better absorbed than traditional forms of Calcium. Included in these fomulas are the trace minerals zinc, potassium and boron. Studies from the USDA indicate that boron may reduce the body’s excretion of calcium and help increase bone density. Complete with added Vitamin K..