Mr. Lopez has a family history of cardiovascular disease and elevated homocysteine levels. A researcher asks Mr. Lopez if he is interested in participating in a trial to look at

Mr. Lopez has a family history of cardiovascular disease and elevated homocysteine levels. A researcher asks Mr. Lopez if he is interested in participating in a trial to look at the effects of a vitamin B12 supplement on cardiovascular events. Why would a researcher hypothesize that a vitamin B12 supplement will reduce Mr Lopez’s cardiovascular risk?
A)Vitamin B12 will decrease his HDL cholesterol.
B)Vitamin B12 is required for the metabolism of methionine.
C)Vitamin B12 will constrict the blood vessels.
D)Vitamin B12 is an electrolyte that regulates heartbeat.


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