Why does a person have to take vitamin k for?

well when i had knee surgery, they found out that i was a type 2 diabetic.I went to my family doctor to let him know what they had found.He kept me on metformin HCL 500mg,also did some blood work and his nurse called me to let me know that the Dr. wanted me to start taking vtamin K 1000 once a month,but didn't... show more well when i had knee surgery, they found out that i was a type 2 diabetic.I went to my family doctor to let him know what they had found.He kept me on metformin HCL 500mg,also did some blood work and his nurse called me to let me know that the Dr. wanted me to start taking vtamin K 1000 once a month,but didn't explain why.
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