Alpha-GPC is a phospholipid metabolite and precursor to phosphatidylcholine and acetylcholine. Alpha-GPC is considered one of the best choline supplements available as it only requires 46% of the dose of CDP-choline to achieve similar effects. It is found in foods such as beef liver, oat bran, Atlantic cod, and milk — though not at levels high enough to be useful — so additional supplementation is worthwhile.
