I agree you may want to check with your dr. I used to take Vitamin E and then my GP told me it really wasn't beneficial to take it because of one of my blood pressure meds. He said research showed it might be worse to take it than not to take it so I stopped using it.
Also, as far as brands... I watched a show on tv several years ago (maybe 60 Minutes or a show like it) and they visited a plant making Vitamin C. They showed them putting all the same pills in the bottles and then labels were added from dozens of companies from store brands to brand name labels. Different labels, same pills. I have also read vitamins are all the same and labels don't matter so you may want to ask your dr that as well or do a bit of research yourself online.