"Jarrow Formulas® K-Right® is a combination of three forms of Vitamin K: MK-7, MK-4 and K1, plus vitamin D3 to support bone and cardiovascular health.* Vitamin K functions in the carboxylation of osteocalcin, which binds calcium in bones.* Vitamin D3 functions in the production of osteocalcin.* Jarrow Formulas® MK-7 is a product of natural fermentation using Bacillus subtilis subsp. natto."