Vitamin B12 supplements with Accutane?

My vitamin b12 level is 260 pg/ml. My doctor prescribed 1500 mcg (methylcobalamin) vitamin b12 dietary supplement for 3months (daily one) I am also taking isotretinoin , I am at end of my course only 2 months left Will taking vitamin b12 supplement aggregates acne again? Is my vb12 low Can I increase with food ( I am vegetarian) Will taking tablets again give me acne? I had taken vb12 injections year back and got acne at the same time for which I am taking accutane.