Back in the days when I sampled, I found it did more harm than good, and I stopped very quickly.
I had undiagnosed reactive hypoglycaemia at the time, and found I moved from happy/giggly/chilled to ravenous/zonked/shaking with low blood glucose, very rapidly.
I'd end up looking like the walking dead - so pale I was grey, red rimmed eyes, shaking and eating anything that moved... Not a good look.
Mind you, the following morning I would feel fantastic. Utterly relaxed, and free of all the random aches and pains that plagued my existence even then. It would last most of the day.
Perhaps I should have gone for smaller quantities
I can imagine it would be fantastic for MS and Fibromyalgia.