Supplements

Alpha-GPC

By Cameron McClevePublished Sep 27, 20262 min read

What is it?

Alpha-GPC (alpha-glycerylphosphorylcholine) is a form of choline. It is included in some pre-workouts mainly for possible mental focus and power benefits. It is not a stimulant or a pump ingredient. [1,2]

How does it work?

Your body uses choline to make acetylcholine, a messenger involved in attention and the signals that make muscles contract. Alpha-GPC can raise choline in the blood. Researchers are studying whether that change helps people feel more focused or perform better during training. [1,2]

Why is it in pre-workout?

Focus

In a 2024 placebo-controlled trial of 20 resistance-trained men, one dose of 315 or 630 mg led to larger improvements on a Stroop attention test than placebo. The score changes were about 11 and 13 points versus 5 points with placebo. The scores were measured from before to after the workout. Other focus tests and participants’ own concentration ratings did not show the same clear benefit, so this is an interesting but narrow result from one small, industry-funded study. [1]

Power and strength

An older 13-man trial found a larger increase in one isometric pulling-force test after six days of 600 mg/day than with placebo. A subsequent 48-man trial found no clear benefit for that pull, an upper-body force test, or a vigilance test after seven days at 250 or 500 mg/day. The 2024 trial also did not find convincing improvements in jump or bench-throw performance. Alpha-GPC may help with a specific task for some people. A dependable improvement in workouts, muscle growth, or the “mind-muscle connection” still needs better evidence. [1–3]

IN THIS SCOOP

How much?

150 mg

FORM & SCHEDULE

What it refers to

Alpha-GPC per scoop

150 mg is this product’s label amount, not a proven effective dose. Studied amounts are not a reason to add extra scoops. Long-term safety is still being studied.

150 mg — Alpha-GPC in the pictured scoop

Read detailed dosing notes

That is the product-label amount, not an established effective workout dose. The most relevant single-dose trial tested 315 mg or 630 mg, with testing beginning about 60 minutes later. Other trials used 250–600 mg/day for six or seven days. Those studied amounts have not established a best pre-workout dose. [1–3]

Long-term safety is also unsettled. One large observational study of older adults linked prescribed alpha-GPC to more strokes; a later study in people with mild cognitive impairment found no overall increase and a lower risk in a subgroup. Neither can show cause and effect or tell us the risk of occasional pre-workout use in younger adults. [4,5]

Sources & further reading