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A vitamin K deficiency with normal vitamin D levels would cause blood calcium levels to rise. Many people are deficient in vitamin K since it's mostly found in leafy greens and liver, no one's favourite foods. The difficulty is judging what is a normal vitamin D level by incidence of people with elevated calcium levels in the blood without having tested all of those people for vitamin K deficiency first.

Is there a way to determine if I'm deficient in Vitamin K2. If yes, is there a way to get supplements for it?

Is vitamin K safe to supplement? Or does it mess with the blood clotting?

People recommend really quite doses: K2-MK7 at 100 to 200mcg, or alternatively K2-MK4 15 to 45 mg (not mcg).

Fermented foods are a potent source of bioavailable K2