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NutraBio Alpha-GPC — 300mg ACTIVE Per Capsule, Not 50% Standardised

NutraBio Alpha-GPC300mg of ACTIVE alpha-GPC per capsule, with calcium phosphate as the carrier. That word "active" is the entire point of this page.⚠ The alpha-GPC labelling trap — and how to spot itThis is one of the most misleading numbers in the supplement industry, and once you know it you will read every pre-workout label differently.Alpha-GPC is hygroscopic — it absorbs moisture from the air aggressively. In pure form it turns into a sticky, unusable mess. So it is almost always sold bound to a carrier, most commonly at 50% standardisation.Which means: "600mg Alpha-GPC (50%)"= 300mg of actual alpha-GPC "300mg Alpha-GPC (50%)"= 150mg of actual alpha-GPC NutraBio: 300mg ACTIVE= 300mg of actual alpha-GPCSo a pre-workout advertising "600mg of Alpha-GPC" is very often delivering the same 300mg this single capsule does. Both statements are technically true; only one tells you what you are getting.How to check any label: look for a percentage in brackets, or the word "active" or "yield". If a product lists a large alpha-GPC number with no standardisation figure at all, assume it is the material weight rather than the active — and halve it in your head.What alpha-GPC actually doesAlpha-GPC is a choline-containing phospholipid found naturally in the brain, and it is one of the most bioavailable choline sources available — it crosses the blood-brain barrier readily, which most choline forms do not.Choline is the raw material for acetylcholine, and acetylcholine does two things that matter here: Cognition. It is the neurotransmitter most directly tied to attention, memory encoding and learning. The cholinergic system governs focused thinking Muscle contraction. Acetylcholine is the signal that crosses the neuromuscular junction to make a muscle fireThat second one is why alpha-GPC appears in pre-workouts rather than only in nootropics. Research has examined it in relation to power output and force production, and it is the mechanism behind the "mind-muscle connection" claim — which, unusually for that phrase, has a plausible physiological basis.Why the form mattersCholine sources are not interchangeable, and the difference is large: Alpha-GPCHighly bioavailable, crosses the blood-brain barrier CDP-choline (citicoline)Also excellent. Slightly different profile Choline bitartrateCheap, poorly absorbed, does not cross wellCholine bitartrate is the one to watch for. It appears in a great many pre-workouts because it is inexpensive — and unabsorbed choline is converted by gut bacteria into trimethylamine, which produces a faintly fishy body or breath odour in some people. That is usually the explanation when someone notices it after starting a supplement.Specs Alpha-GPC300mg ACTIVE per capsule CarrierCalcium phosphate Other ingredientsNone beyond the capsule LabelFully disclosed, no proprietary blends TestingThird-party tested, results published at checkmysupps.comResearched doses generally sit between 300mg and 600mg of active alpha-GPC, so one capsule is a working dose and two is at the upper end of what has been studied.How to take it One capsule (300mg active) is a full working dose. Two if you want the upper research range. 30 to 60 minutes before training for the power output and focus effects. Or in the morning if you are taking it for cognition rather than training. Check your pre-workout first. Many contain alpha-GPC — and now you know how to work out how much is actually in there. ⚠ Take it with food if you get headaches. Excess cholinergic activity can cause headaches, and that is the most commonly reported side effect.Who this is for Anyone who wants a verified active dose rather than a standardised material figure People adding focus to a stimulant-free pre-workout stack Anyone interested in the power output and force production research People who want cognitive support without stimulants — this is not a stimulant at all Anyone whose pre-workout uses choline bitartrate and wants a better-absorbed formWho this is not forIf your pre-workout already contains 600mg of standardised alpha-GPC, you are already getting 300mg active — adding this doubles it, which may be more than you want.If you get headaches from cholinergic supplements, this is the most common side effect. Start with one capsule and take it with food.If you want a broader nootropic effect, alpha-GPC pairs logically with huperzine A — one supplies raw material, the other slows acetylcholine breakdown.Speak to your doctor first if you take any medication affecting acetylcholine, including some Alzheimer's medications, which work on the same system.Not for anyone under 18, pregnant or nursing.Stack it with: citrulline and beta-alanine for a complete stimulant-free pre-workout you have built yourself.Frequently asked questionsWhat does "ACTIVE" mean on the label?That the 300mg figure is actual alpha-GPC, not the weight of standardised material. Most alpha-GPC is 50% standardised, so a "600mg" claim elsewhere often delivers the same 300mg.Why is alpha-GPC sold on a carrier?It absorbs moisture from the air aggressively and becomes a sticky, unusable mass in pure form. A carrier keeps it stable and dosable.How much should I take?Researched doses run 300 to 600mg of active alpha-GPC. One capsule is a working dose; two is the upper end.Is it a stimulant?No. It supports focus through acetylcholine rather than through stimulation, so it can be taken at any time.Why is it in pre-workouts?Acetylcholine is the signal that crosses the neuromuscular junction to trigger muscle contraction, and alpha-GPC has been researched in relation to power output.How does it compare to choline bitartrate?Far better absorbed, and it crosses the blood-brain barrier where bitartrate largely does not. Bitartrate is cheap, which is why it is common.Can it cause side effects?Headaches are the most commonly reported, from excess cholinergic activity. Start with one capsule and take it with food.Is it already in my pre-workout?Quite possibly. Check the label for a percentage in brackets — if there is no standardisation figure, assume the number is material weight rather than active. Read more

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PRODUCT LABEL

NutraBio Alpha-GPC

300mg of ACTIVE alpha-GPC per capsule, with calcium phosphate as the carrier. That word "active" is the entire point of this page.

⚠ The alpha-GPC labelling trap — and how to spot it

This is one of the most misleading numbers in the supplement industry, and once you know it you will read every pre-workout label differently.

Alpha-GPC is hygroscopic — it absorbs moisture from the air aggressively. In pure form it turns into a sticky, unusable mess. So it is almost always sold bound to a carrier, most commonly at 50% standardisation.

Which means:

"600mg Alpha-GPC (50%)"	= 300mg of actual alpha-GPC
"300mg Alpha-GPC (50%)"	= 150mg of actual alpha-GPC
NutraBio: 300mg ACTIVE	= 300mg of actual alpha-GPC

So a pre-workout advertising "600mg of Alpha-GPC" is very often delivering the same 300mg this single capsule does. Both statements are technically true; only one tells you what you are getting.

How to check any label: look for a percentage in brackets, or the word "active" or "yield". If a product lists a large alpha-GPC number with no standardisation figure at all, assume it is the material weight rather than the active — and halve it in your head.

What alpha-GPC actually does

Alpha-GPC is a choline-containing phospholipid found naturally in the brain, and it is one of the most bioavailable choline sources available — it crosses the blood-brain barrier readily, which most choline forms do not.

Choline is the raw material for acetylcholine, and acetylcholine does two things that matter here:

Cognition. It is the neurotransmitter most directly tied to attention, memory encoding and learning. The cholinergic system governs focused thinking
Muscle contraction. Acetylcholine is the signal that crosses the neuromuscular junction to make a muscle fire

That second one is why alpha-GPC appears in pre-workouts rather than only in nootropics. Research has examined it in relation to power output and force production, and it is the mechanism behind the "mind-muscle connection" claim — which, unusually for that phrase, has a plausible physiological basis.

Why the form matters

Choline sources are not interchangeable, and the difference is large:

Alpha-GPC	Highly bioavailable, crosses the blood-brain barrier
CDP-choline (citicoline)	Also excellent. Slightly different profile
Choline bitartrate	Cheap, poorly absorbed, does not cross well

Choline bitartrate is the one to watch for. It appears in a great many pre-workouts because it is inexpensive — and unabsorbed choline is converted by gut bacteria into trimethylamine, which produces a faintly fishy body or breath odour in some people. That is usually the explanation when someone notices it after starting a supplement.

Specs

Alpha-GPC	300mg ACTIVE per capsule
Carrier	Calcium phosphate
Other ingredients	None beyond the capsule
Label	Fully disclosed, no proprietary blends
Testing	Third-party tested, results published at checkmysupps.com

Researched doses generally sit between 300mg and 600mg of active alpha-GPC, so one capsule is a working dose and two is at the upper end of what has been studied.

How to take it

One capsule (300mg active) is a full working dose. Two if you want the upper research range.
30 to 60 minutes before training for the power output and focus effects.
Or in the morning if you are taking it for cognition rather than training.
Check your pre-workout first. Many contain alpha-GPC — and now you know how to work out how much is actually in there.
⚠ Take it with food if you get headaches. Excess cholinergic activity can cause headaches, and that is the most commonly reported side effect.

Who this is for

Anyone who wants a verified active dose rather than a standardised material figure
People adding focus to a stimulant-free pre-workout stack
Anyone interested in the power output and force production research
People who want cognitive support without stimulants — this is not a stimulant at all
Anyone whose pre-workout uses choline bitartrate and wants a better-absorbed form

Who this is not for

If your pre-workout already contains 600mg of standardised alpha-GPC, you are already getting 300mg active — adding this doubles it, which may be more than you want.

If you get headaches from cholinergic supplements, this is the most common side effect. Start with one capsule and take it with food.

If you want a broader nootropic effect, alpha-GPC pairs logically with huperzine A — one supplies raw material, the other slows acetylcholine breakdown.

Speak to your doctor first if you take any medication affecting acetylcholine, including some Alzheimer's medications, which work on the same system.

Not for anyone under 18, pregnant or nursing.

Stack it with: citrulline and beta-alanine for a complete stimulant-free pre-workout you have built yourself.

Frequently asked questions

What does "ACTIVE" mean on the label?
That the 300mg figure is actual alpha-GPC, not the weight of standardised material. Most alpha-GPC is 50% standardised, so a "600mg" claim elsewhere often delivers the same 300mg.

Why is alpha-GPC sold on a carrier?
It absorbs moisture from the air aggressively and becomes a sticky, unusable mass in pure form. A carrier keeps it stable and dosable.

How much should I take?
Researched doses run 300 to 600mg of active alpha-GPC. One capsule is a working dose; two is the upper end.

Is it a stimulant?
No. It supports focus through acetylcholine rather than through stimulation, so it can be taken at any time.

Why is it in pre-workouts?
Acetylcholine is the signal that crosses the neuromuscular junction to trigger muscle contraction, and alpha-GPC has been researched in relation to power output.

How does it compare to choline bitartrate?
Far better absorbed, and it crosses the blood-brain barrier where bitartrate largely does not. Bitartrate is cheap, which is why it is common.

Can it cause side effects?
Headaches are the most commonly reported, from excess cholinergic activity. Start with one capsule and take it with food.

Is it already in my pre-workout?
Quite possibly. Check the label for a percentage in brackets — if there is no standardisation figure, assume the number is material weight rather than active.