All the threads on l-serine get killed pretty fast but I was curious to know how l-serine is going for other people. My mom was diagnosed last June and had been declining for about a year before that. She has been taking the l-serine I had been buying for her and seems to be progressing more slowly now. I was also curious because I have found a few places to buy l-serine some of which sell it in a 99% pure form others in a form with 40% fillers. If you didn't get the 99% pure then you would be taking only 60 percent the dosage you thought you were. The first batches of l-serine I bought for my mom had that problem. The bag should say 99% pure or pharmaceutical grade.