Most of the drug companies for MS medications have assistance plans for low income folks. For example, Biogen has a program called the "Avonex Access Program."
the AVONEX Access Program, which provides support to qualified uninsured patients. You don't need to have a prescription for AVONEX to call us. If you have limited financial resources, you may be eligible for assistance. For more information, call 1.800.456.2255.
The level of assistance is based on a sliding scale so they should be able to help out. I realize that it's not an answer to your question about vitamins but it may be helpful for you. Anyways, with respect to vitamins and supplements, you may want to consider looking into fish oil, green tea, r-lipoic acid, turmeric, and vitamin D3 and don't forget magnesium. There has been quite a bit of discussion on these and other supplements on the Natural Approach