There is some evidence that Ginkgo helps ameliorate symptoms of MS. This is a pretty good study, though it needs to have a much larger N.
Here is another article on the same study.
There are many studies that link Ginkgo to memory, but the findings are, IMHO a bit soft. I think that there are indeed herbs (and very likely Ginkgo) that improve memory. But I’d like to see more and better studies. Maybe I’m just a stickler for scientific rigor.
In any case, this is a great (and cheap) way to improve cognitive functioning in MS sufferers with hardly any side effect.