I've taken it in the past. Never noticed any effects.
Other's experience:
From Ray Sahelian:
http://www.raysaheli...m/alphagpc.html
My experience:
Alpha GPC is a newcomer in the mind boosting supplement field. My first morning I took one 300 mg capsule. By mid morning I had not noticed much, so I took another pill. Except for slight alertness, I can't say I noticed much of a positive or negative effect. A few days later, I took 3 capsules in the morning. By midday I noticed being more alert and there was a very mild relaxation effect which is unlike other brain boosters that make me feel stimulated. The next day I took 2 capsules and the effects were similar. Overall, I did not find the short term effects of alpha GPC to be very potent. I don't have a strong urge to take it again any time soon, although I can see it being useful as a mild mental enhancer in those who find acetyl-carnitine, DMAE, or other brain boosters too stimulating and would prefer a gentler brain enhancer. One option is to alternate alpha GPC one day and Mind Power Rx the next day. It may offer long term benefits as discussed in the research studies listed above. One has to keep in mind that even if no significant benefits are observed in the short term, this does not mean that a supplement won't have long term benefits. Alpha GPC does not seem to be a supplement to take for occasional use as a mental enhancer. Mind Power Rx, acetylcarnitine, CDP-choline, DMAE, are better options for a quick mind boost along with bacopa which is considered a memory herb pill.