My B12 score was 140 pg/ML when I got tested in January (thanks for prompting me, mrsD!). I recently started on B12 shots; my GP recommended three shots a weeks over 8 weeks initially. She thinks I might have a problem with intrinsic factor and I also take meds for my GERD which can hinder absorption of B12 (thanks again, mrs D!). Now, because of my GERD, I can't take too much citrus fruits or vitamin C orally as my stomach will bloat. I'm thinking of getting vitamin C shots once a week at the same time as my B12 shots. My GP says she can administer them intravenously and simultaneously. My question is: can vitamin B12 interact with vitamin C negatively if administered this way?