I have been using the Lion Nutrtion B12 for about 2 weeks now. I really havent felt any difference whatsoever. I used daily for 2 weeks and then started once E3D. I didnt expect any earthshattering fireworks but had hoped to feel a bit of energy increase or something. I may try some of the stuff from pumpnpose........its only $8!! Thats a lot cheaper than the LN stuff I bought. I know cheaper doesnt always mean better but may as well give it a shot. anyone ever use it from there? btw I thought AC guys didnt have b12 anymore...guess I should look them up again.