Hi Riverwild,
I think it varies tremendously from person to person. I could feel it in my nervous system after a few daze but it took 2 or 3 weeks until I began to see it improve my walking.

Jappy, It has not affected my stomach at all. I am on 10 drugs for MS and heart stuff. i am on Cellcept as a DMD for MS. I was worried about that and my stomach, but I'm fine. Again, sx vary from person to person.

Good luck you guys. It has improved my life in a multitude of ways.
-Susan