All depends how many ML are in each vial which you did not state in the question. if they are 10ml bottles each one would yield 500mg meaning you would need 6 vials to arrive at the 3000mgs you need for the 10m weeks. If they are 20ml bottles you only need 3 vials. Hope that helps.

Now, if train leaves Chicago going east at 65mph hour and a car leaves New York going west at 45mph where will they intersect???