BIOTEST® Fast-Acting Liquid Alpha-GPC contains the most potent, highest quality, and most pure form of L-alpha-glycerylphosphorylcholine available.

Alpha-GPC is a precursor to the neurotransmitter acetylcholine. Clinically, it\\\\\\\'s been used both orally and intramuscularly to treat Alzheimer\\\\\\\'s disease, vascular dementia, stroke, transient ischemic attack (TIA), as well as to improve memory, cognitive function, and learning. Clearly, you don\\\\\\\'t have to be a physician to see that it has profound effects on the nervous system. However, prior to Dr. Ziegenfuss, not many researchers thought to test alpha-GPC on advanced athletes. On the other hand, choline, which is a precursor to alpha-GPC, has been tested on athletes and shown to improve athletic performance and endurance.

The thinking is this:

Acetylcholine is a major neurotransmitter that activates muscle contraction. Increasing the amount of acetylcholine (which is depleted by exercise) in cells can therefore keep muscles contracting longer and harder.

However, alpha-GPC is a much better precursor to acetylcholine and, unlike choline, alpha-GPC raises GH levels substantially.