Always consult your healthcare provider before using our products, if you are taking a prescription medication.You may opt to work with a Naturopathic doctor (ND), Osteopath (DO) or other integrative, licensed healthcare practitioner who understands both herbal and conventional medicine to help you determine which products may be appropriate. There is vitamin K2 in PURE's CalciuMK+, but it is not added to any of our other products. There are trace amounts in our Greens product, as vitamin K is found in green leafy lettuce and other vegetables. We recommend working with your healthcare practitioner if you have been cautioned to monitor your intake vitamin K.