I would strongly suggest that if you go the oral route, try allithiamine, the only thiamine I know of that penetrates the blood brain barrier. It made an IMMEDIATE difference for me at only 50 mg a day. I tried them all benefontiamine, thiamine, etc) and it's the only one that worked and it worked quite well.

For me it was an immediate improvement in balance and coordination. You only have $20 to lose ..