I started taking DMG (dimethylglycine) about 10 days ago and it seems to be great stuff, boosting my energy. And then I found out (it took way too long to figure this out!) that it was causing my potassium to tank pretty badly. I ended up with severe fatigue, aches and blurred vision and only yesterday realized what was going on. I've more than doubled my usual 1000 mg. of potassium gluconate and my energy is coming back and vision is clearing up. It seems to be great stuff though I know not for everyone. Some people do better with TMG, but that did nothing for me. But I just wanted to make people aware they need to watch for low potassium symptoms with DMG. I had the same reaction when I first started methylfolate 5 years ago.