You could also ask a Pharmacist. They really are a great resource. Hope you get an answer soon.
My GP has recommended certain vitamins to me and they've actually made me worse, one lot giving me tremors and all the withdrawal feelings.
I take a multi B, B12 and celery and have found these ok for me. When I got the multi B the chemist was really good and pointed out one lot that actually had herbs in it as well and she said they'd react with your meds so steer clear of them.
I guess vitamins are like any meds it's all trial and error.