This is the second time I've gotten this reaction from this supplement. I had to stop taking this the first time I took it because eventually it caused insomnia. All of my muscles feel stronger within an hour of taking this. Orthostatic intolerance makes me lay back down at the same rate as before tho but I get petite mals easily from being upright. I tried researching adenosine and adenosyl but got confused. I knew it was part of atp but didn't realize where all it's used. I was thinking that I might benefit from other adenosyl + supplements. Is there any research on this ? Thanks .. X Ps. Mb12 doesn't appear to do anything for me.