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NutraBio AAKG — Arginine Alpha-Ketoglutarate 2:1 Powder, 143 Servings

NutraBio AAKG (L-Arginine Alpha-Ketoglutarate)Pure arginine alpha-ketoglutarate at a 2:1 ratio, with no fillers or excipients. 143 servings.⚠ Read this first: citrulline is usually the better buyWe would rather tell you this up front than take the sale.Arginine is the direct precursor to nitric oxide, so it seems like it should be the most effective supplement for pumps. It generally is not, because of something called the arginine paradox: Oral arginine is largely destroyed before it reaches your bloodstream. The gut and liver break most of it down in what is called the first-pass effect Doses large enough to overcome that upset the stomach, so you cannot simply take moreCitrulline sidesteps both problems. It passes through the gut and liver intact, then converts to arginine in the kidneys — meaning citrulline raises blood arginine levels more effectively than arginine does.That is not marketing, it is why the whole industry moved to citrulline. If pumps are your goal, buy L-Citrulline instead.So why does this product exist?Because arginine does other things, and there are legitimate reasons to take it. Growth hormone secretion. Arginine has research behind stimulating GH release — though note the same caveat we give on our glutamine page: a transient GH rise does not reliably translate into muscle growth Ammonia clearance. Arginine is central to the urea cycle, which clears ammonia produced during protein metabolism and hard training Creatine synthesis. Your body makes creatine from arginine, glycine and methionine — arginine is a direct precursor Immune and wound-healing roles, where arginine becomes conditionally essential under physiological stress Cardiovascular research, where arginine has been studied for endothelial functionThe alpha-ketoglutarate portion is not filler either — AKG is a Krebs cycle intermediate involved in energy production and nitrogen transport. Whether pairing it with arginine improves absorption is not well established, but it is not an inert carrier.The honest summaryBuy this if you want arginine specifically — for its urea cycle role, for GH research, or because you already know you respond to it.Buy citrulline instead if you want pumps, vascularity or endurance. It does the arginine job better than arginine does.Or take both: some pre-workouts pair them deliberately, on the reasoning that citrulline raises the baseline while arginine adds an acute spike. That is a defensible approach, though the evidence for the combination beating citrulline alone is thin.Specs AAKGArginine alpha-ketoglutarate 2:1 Other ingredientsNone Servings143 FlavourUnflavoured ManufactureNutraBio's GMP-certified, FDA-inspected New Jersey facility TestingThird-party tested to 99.98% purity or greater, published at checkmysupps.com143 servings is a genuinely long-lasting tub, and single-ingredient powders cost a fraction per gram of the same active inside a flavoured formula.How to take it Take it on an empty stomach. This matters more with arginine than most supplements — food substantially reduces absorption of an already poorly-absorbed compound. 30 to 60 minutes before training, or first thing in the morning if you are taking it for the GH research. Start with a smaller dose. Arginine is well known for causing stomach upset and loose stools at higher amounts — build up rather than starting large. Mix into water, not a protein shake, if absorption matters to you. Do not take it alongside a large protein meal — other amino acids compete for the same transporters.Who this is for Anyone who specifically wants arginine rather than a nitric oxide product generally People interested in the urea cycle and ammonia clearance side Anyone who already knows they respond well to arginine People stacking it with citrulline deliberately Anyone who wants an extremely cost-effective single ingredientWho this is not forIf pumps are your goal, buy citrulline. It raises arginine better than this does. We will say the same at the counter.If you have a sensitive stomach, arginine is one of the more likely supplements to cause GI upset.Anyone who gets cold sores. Arginine can promote herpes simplex replication, and lysine is generally recommended as the counterbalance. Worth knowing if you are prone to them.Speak to your doctor before use if you take blood pressure medication, or have had a heart attack.Not for anyone under 18, pregnant or nursing.Stack it with: citrulline if you want both mechanisms, or beta-alanine and creatine for a broader stimulant-free stack.Frequently asked questionsIs arginine or citrulline better for pumps?Citrulline, clearly. Oral arginine is largely destroyed before absorption, while citrulline survives digestion and converts to arginine afterwards — raising arginine levels more effectively than arginine itself.What is the arginine paradox?That arginine, despite being the direct nitric oxide precursor, is a poor oral supplement — because first-pass metabolism destroys most of it and larger doses cause stomach upset.What is AAKG?Arginine bonded to alpha-ketoglutarate, a Krebs cycle intermediate involved in energy production and nitrogen transport.Why take arginine at all then?For its role in the urea cycle clearing ammonia, as a creatine precursor, for the growth hormone research, and its immune and wound-healing roles.Should I take it with food?No — on an empty stomach. Food substantially reduces absorption, and other amino acids compete for the same transporters.Will it upset my stomach?It can. Arginine is well known for causing GI discomfort at higher doses, so start small and build up.Is it a problem if I get cold sores?Possibly. Arginine can promote herpes simplex replication, and lysine is usually recommended as the counterbalance.Can I take it with citrulline?Yes, and some formulas pair them deliberately. The evidence that the combination beats citrulline alone is thin, but there is no conflict. Read more

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PRODUCT LABEL

NutraBio AAKG (L-Arginine Alpha-Ketoglutarate)

Pure arginine alpha-ketoglutarate at a 2:1 ratio, with no fillers or excipients. 143 servings.

⚠ Read this first: citrulline is usually the better buy

We would rather tell you this up front than take the sale.

Arginine is the direct precursor to nitric oxide, so it seems like it should be the most effective supplement for pumps. It generally is not, because of something called the arginine paradox:

Oral arginine is largely destroyed before it reaches your bloodstream. The gut and liver break most of it down in what is called the first-pass effect
Doses large enough to overcome that upset the stomach, so you cannot simply take more

Citrulline sidesteps both problems. It passes through the gut and liver intact, then converts to arginine in the kidneys — meaning citrulline raises blood arginine levels more effectively than arginine does.

That is not marketing, it is why the whole industry moved to citrulline. If pumps are your goal, buy L-Citrulline instead.

So why does this product exist?

Because arginine does other things, and there are legitimate reasons to take it.

Growth hormone secretion. Arginine has research behind stimulating GH release — though note the same caveat we give on our glutamine page: a transient GH rise does not reliably translate into muscle growth
Ammonia clearance. Arginine is central to the urea cycle, which clears ammonia produced during protein metabolism and hard training
Creatine synthesis. Your body makes creatine from arginine, glycine and methionine — arginine is a direct precursor
Immune and wound-healing roles, where arginine becomes conditionally essential under physiological stress
Cardiovascular research, where arginine has been studied for endothelial function

The alpha-ketoglutarate portion is not filler either — AKG is a Krebs cycle intermediate involved in energy production and nitrogen transport. Whether pairing it with arginine improves absorption is not well established, but it is not an inert carrier.

The honest summary

Buy this if you want arginine specifically — for its urea cycle role, for GH research, or because you already know you respond to it.

Buy citrulline instead if you want pumps, vascularity or endurance. It does the arginine job better than arginine does.

Or take both: some pre-workouts pair them deliberately, on the reasoning that citrulline raises the baseline while arginine adds an acute spike. That is a defensible approach, though the evidence for the combination beating citrulline alone is thin.

Specs

AAKG	Arginine alpha-ketoglutarate 2:1
Other ingredients	None
Servings	143
Flavour	Unflavoured
Manufacture	NutraBio's GMP-certified, FDA-inspected New Jersey facility
Testing	Third-party tested to 99.98% purity or greater, published at checkmysupps.com

143 servings is a genuinely long-lasting tub, and single-ingredient powders cost a fraction per gram of the same active inside a flavoured formula.

How to take it

Take it on an empty stomach. This matters more with arginine than most supplements — food substantially reduces absorption of an already poorly-absorbed compound.
30 to 60 minutes before training, or first thing in the morning if you are taking it for the GH research.
Start with a smaller dose. Arginine is well known for causing stomach upset and loose stools at higher amounts — build up rather than starting large.
Mix into water, not a protein shake, if absorption matters to you.
Do not take it alongside a large protein meal — other amino acids compete for the same transporters.

Who this is for

Anyone who specifically wants arginine rather than a nitric oxide product generally
People interested in the urea cycle and ammonia clearance side
Anyone who already knows they respond well to arginine
People stacking it with citrulline deliberately
Anyone who wants an extremely cost-effective single ingredient

Who this is not for

If pumps are your goal, buy citrulline. It raises arginine better than this does. We will say the same at the counter.

If you have a sensitive stomach, arginine is one of the more likely supplements to cause GI upset.

Anyone who gets cold sores. Arginine can promote herpes simplex replication, and lysine is generally recommended as the counterbalance. Worth knowing if you are prone to them.

Speak to your doctor before use if you take blood pressure medication, or have had a heart attack.

Not for anyone under 18, pregnant or nursing.

Stack it with: citrulline if you want both mechanisms, or beta-alanine and creatine for a broader stimulant-free stack.

Frequently asked questions

Is arginine or citrulline better for pumps?
Citrulline, clearly. Oral arginine is largely destroyed before absorption, while citrulline survives digestion and converts to arginine afterwards — raising arginine levels more effectively than arginine itself.

What is the arginine paradox?
That arginine, despite being the direct nitric oxide precursor, is a poor oral supplement — because first-pass metabolism destroys most of it and larger doses cause stomach upset.

What is AAKG?
Arginine bonded to alpha-ketoglutarate, a Krebs cycle intermediate involved in energy production and nitrogen transport.

Why take arginine at all then?
For its role in the urea cycle clearing ammonia, as a creatine precursor, for the growth hormone research, and its immune and wound-healing roles.

Should I take it with food?
No — on an empty stomach. Food substantially reduces absorption, and other amino acids compete for the same transporters.

Will it upset my stomach?
It can. Arginine is well known for causing GI discomfort at higher doses, so start small and build up.

Is it a problem if I get cold sores?
Possibly. Arginine can promote herpes simplex replication, and lysine is usually recommended as the counterbalance.

Can I take it with citrulline?
Yes, and some formulas pair them deliberately. The evidence that the combination beats citrulline alone is thin, but there is no conflict.