Posted by iHerb Customer on Jan 04, 2011 | Verified Purchase
D-Ribose has enabled me to think again. I suffer from a severe case of CFS. I had trouble making calculations and comprehending multiple ideas at once. I recommended this to a friend with Fybromyalgia and he says it has given him his brain back. It is hard to understand how frustrating it is to be aware that you can't process information. You can't trust your own mind. I have tried different varieties of D-Ribose. This one is the least expensive and does a great job.