NutraBio Citrulline pump powder, front of container

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NutraBio L-Citrulline — Pure, Not Malate, Unflavoured with No Fillers

Name: NutraBio L-Citrulline — Pure, Not Malate, Unflavoured with No Fillers
Brand: NutraBio
SKU: 4990823600
Price: 23.99 USD
Availability: InStock

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NutraBio L-CitrullinePure L-citrulline — not citrulline malate — with no fillers, sweeteners or excipients. Unflavoured, so it mixes into anything.Pure versus malate: the arithmetic that changes everythingThis is the single most useful thing to understand about pump ingredients, and it is why this tub exists.Citrulline malate is citrulline bonded to malic acid, usually at a 2:1 ratio. That means roughly a third of the weight on the label is malic acid, not citrulline. 6g citrulline malatedelivers about 4g actual citrulline 8g citrulline malatedelivers about 5.3g actual citrulline 10g citrulline malatedelivers about 6.7g actual citrulline 6g pure L-citrullinedelivers 6gThe researched range for pump and performance is 6 to 8 grams of actual citrulline. So a product advertising "6g citrulline malate" is sitting below the range, while 6g of pure sits squarely inside it.Neither form is dishonest — malic acid has its own role in energy metabolism — but you cannot compare the two numbers directly, and a great many product pages invite you to.Why citrulline rather than arginineHere is the part that surprises people: citrulline raises blood arginine levels more effectively than arginine does.Arginine is the direct precursor to nitric oxide, so logically it should be the better supplement. It is not, for two reasons known together as the arginine paradox: Oral arginine is largely destroyed before it reaches circulation — broken down in the gut and liver in what is called the first-pass effect Doses large enough to overcome that cause stomach upset, so you cannot simply take moreCitrulline sidesteps both. It passes through the gut and liver untouched, then converts to arginine in the kidneys. The result is higher, longer-lasting arginine levels from a smaller, better-tolerated dose.That is why the entire industry moved from arginine to citrulline, and why our L-Arginine page is honest about where arginine still has a place.What it actually doesMore arginine means more substrate for nitric oxide synthase, the enzyme that produces nitric oxide. Nitric oxide relaxes the smooth muscle in blood vessel walls, widening them.The effects worth expecting: Pump and vascularity — more blood volume reaching working muscle Endurance — the better-supported benefit, honestly. Citrulline has research behind reduced fatigue and increased reps to failure Reduced soreness — several studies report lower muscle soreness in the days after trainingWhat not to expect: citrulline is not a stimulant. A pump is not the same as feeling switched on, and if you take this expecting energy you will be disappointed.Specs L-CitrullinePure, free-form. Not malate Other ingredientsNone FlavourUnflavoured ManufactureNutraBio's own facility, USA LabelFully disclosed⚠ One honest note on taste. Pure L-citrulline is noticeably sour and slightly bitter. Unflavoured does not mean tasteless — mix it into something flavoured rather than plain water, or expect a sharp drink.Why buy it separately Your pre-workout is underdosed. Very common. Adding 2–4g here brings a 4g product into the researched range for very little money You want pumps without stimulants — evening training, deload weeks, or if caffeine does not suit you You want to control the dose rather than accept whatever a blend decided Cost per gram. Buying the active on its own is dramatically cheaper than buying it inside a flavoured formula⚠ Worth knowing: stimulants cause some vasoconstriction while citrulline causes vasodilation, so they partially oppose each other. If pumps are your priority, a lower-stimulant pre-workout with a separate citrulline dose often works better than one very strong product.How to take it 6 to 8 grams, 30 to 45 minutes before training. Citrulline needs longer than most ingredients to convert and peak. Mix into 10 to 16oz of a flavoured drink rather than plain water. Daily use is fine and there is some evidence benefits build with consistent intake. Stacks with anything — it is stimulant-free. Do not double up with a pre-workout already carrying a full dose.Who this is for Anyone whose pre-workout is underdosed on citrulline People who want pumps without stimulants, or who train late Endurance athletes — the fatigue and reps-to-failure research is the strongest evidence citrulline has Anyone who wants to control their own dosing People who would rather pay for the active than for flavouringWho this is not forIf you want energy, there is no stimulant here at all.If your pre-workout already carries 6–8g of pure citrulline, this is redundant.If you dislike sour, sharp drinks, mix it into something flavoured.If you want a complete pump product with glycerol and nitrates as well, a formulated option covers more mechanisms.Speak to your doctor before use if you take blood pressure medication — citrulline affects vasodilation.Not for anyone under 18, pregnant or nursing.Stack it with: beta-alanine and creatine. Between them you have covered blood flow, acid buffering and phosphocreatine — the three best-evidenced mechanisms available, for a fraction of a branded pre-workout.Frequently asked questionsWhat is the difference between L-citrulline and citrulline malate?Citrulline malate is citrulline bonded to malic acid, usually 2:1, so about a third of the weight is malic acid. 8g of citrulline malate delivers roughly 5.3g of actual citrulline. Pure delivers its full face value.How much should I take?6 to 8 grams, which is the researched range for pump and performance.Why not just take arginine?Oral arginine is largely destroyed before absorption, and the doses needed to compensate upset the stomach. Citrulline survives digestion and converts to arginine afterwards, raising arginine levels more effectively.How long before training?30 to 45 minutes. Citrulline takes longer to peak than most ingredients.Does it taste of anything?Yes — it is distinctly sour and slightly bitter. Mix it into a flavoured drink rather than water.Can I take it every day?Yes, and there is some evidence that benefits build with consistent intake.Will it give me energy?No. It is stimulant-free. A pump is a different thing from feeling alert.Can I add it to my pre-workout?Yes, if yours is underdosed — many are. Check the label first and note whether it lists pure citrulline or malate. Read more

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PRODUCT LABEL

NutraBio L-Citrulline

Pure L-citrulline — not citrulline malate — with no fillers, sweeteners or excipients. Unflavoured, so it mixes into anything.

Pure versus malate: the arithmetic that changes everything

This is the single most useful thing to understand about pump ingredients, and it is why this tub exists.

Citrulline malate is citrulline bonded to malic acid, usually at a 2:1 ratio. That means roughly a third of the weight on the label is malic acid, not citrulline.

6g citrulline malate	delivers about 4g actual citrulline
8g citrulline malate	delivers about 5.3g actual citrulline
10g citrulline malate	delivers about 6.7g actual citrulline
6g pure L-citrulline	delivers 6g

The researched range for pump and performance is 6 to 8 grams of actual citrulline. So a product advertising "6g citrulline malate" is sitting below the range, while 6g of pure sits squarely inside it.

Neither form is dishonest — malic acid has its own role in energy metabolism — but you cannot compare the two numbers directly, and a great many product pages invite you to.

Why citrulline rather than arginine

Here is the part that surprises people: citrulline raises blood arginine levels more effectively than arginine does.

Arginine is the direct precursor to nitric oxide, so logically it should be the better supplement. It is not, for two reasons known together as the arginine paradox:

Oral arginine is largely destroyed before it reaches circulation — broken down in the gut and liver in what is called the first-pass effect
Doses large enough to overcome that cause stomach upset, so you cannot simply take more

Citrulline sidesteps both. It passes through the gut and liver untouched, then converts to arginine in the kidneys. The result is higher, longer-lasting arginine levels from a smaller, better-tolerated dose.

That is why the entire industry moved from arginine to citrulline, and why our L-Arginine page is honest about where arginine still has a place.

What it actually does

More arginine means more substrate for nitric oxide synthase, the enzyme that produces nitric oxide. Nitric oxide relaxes the smooth muscle in blood vessel walls, widening them.

The effects worth expecting:

Pump and vascularity — more blood volume reaching working muscle
Endurance — the better-supported benefit, honestly. Citrulline has research behind reduced fatigue and increased reps to failure
Reduced soreness — several studies report lower muscle soreness in the days after training

What not to expect: citrulline is not a stimulant. A pump is not the same as feeling switched on, and if you take this expecting energy you will be disappointed.

Specs

L-Citrulline	Pure, free-form. Not malate
Other ingredients	None
Flavour	Unflavoured
Manufacture	NutraBio's own facility, USA
Label	Fully disclosed

⚠ One honest note on taste. Pure L-citrulline is noticeably sour and slightly bitter. Unflavoured does not mean tasteless — mix it into something flavoured rather than plain water, or expect a sharp drink.

Why buy it separately

Your pre-workout is underdosed. Very common. Adding 2–4g here brings a 4g product into the researched range for very little money
You want pumps without stimulants — evening training, deload weeks, or if caffeine does not suit you
You want to control the dose rather than accept whatever a blend decided
Cost per gram. Buying the active on its own is dramatically cheaper than buying it inside a flavoured formula

⚠ Worth knowing: stimulants cause some vasoconstriction while citrulline causes vasodilation, so they partially oppose each other. If pumps are your priority, a lower-stimulant pre-workout with a separate citrulline dose often works better than one very strong product.

How to take it

6 to 8 grams, 30 to 45 minutes before training. Citrulline needs longer than most ingredients to convert and peak.
Mix into 10 to 16oz of a flavoured drink rather than plain water.
Daily use is fine and there is some evidence benefits build with consistent intake.
Stacks with anything — it is stimulant-free.
Do not double up with a pre-workout already carrying a full dose.

Who this is for

Anyone whose pre-workout is underdosed on citrulline
People who want pumps without stimulants, or who train late
Endurance athletes — the fatigue and reps-to-failure research is the strongest evidence citrulline has
Anyone who wants to control their own dosing
People who would rather pay for the active than for flavouring

Who this is not for

If you want energy, there is no stimulant here at all.

If your pre-workout already carries 6–8g of pure citrulline, this is redundant.

If you dislike sour, sharp drinks, mix it into something flavoured.

If you want a complete pump product with glycerol and nitrates as well, a formulated option covers more mechanisms.

Speak to your doctor before use if you take blood pressure medication — citrulline affects vasodilation.

Not for anyone under 18, pregnant or nursing.

Stack it with: beta-alanine and creatine. Between them you have covered blood flow, acid buffering and phosphocreatine — the three best-evidenced mechanisms available, for a fraction of a branded pre-workout.

Frequently asked questions

What is the difference between L-citrulline and citrulline malate?
Citrulline malate is citrulline bonded to malic acid, usually 2:1, so about a third of the weight is malic acid. 8g of citrulline malate delivers roughly 5.3g of actual citrulline. Pure delivers its full face value.

How much should I take?
6 to 8 grams, which is the researched range for pump and performance.

Why not just take arginine?
Oral arginine is largely destroyed before absorption, and the doses needed to compensate upset the stomach. Citrulline survives digestion and converts to arginine afterwards, raising arginine levels more effectively.

How long before training?
30 to 45 minutes. Citrulline takes longer to peak than most ingredients.

Does it taste of anything?
Yes — it is distinctly sour and slightly bitter. Mix it into a flavoured drink rather than water.

Can I take it every day?
Yes, and there is some evidence that benefits build with consistent intake.

Will it give me energy?
No. It is stimulant-free. A pump is a different thing from feeling alert.

Can I add it to my pre-workout?
Yes, if yours is underdosed — many are. Check the label first and note whether it lists pure citrulline or malate.