Project AD NITR-OX pre-workout powder, front of container

Project AD NITR-OX pre-workout powder, Unflavored flavor

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Project AD NITR-OX — 10g Citrulline + Glycerol, Stim-Free Pump Formula

Project AD NITR-OX10 grams of pure L-citrulline plus glycerol and a full electrolyte panel, in a 16,250mg pump blend. Completely stimulant-free, and designed to stack with anything.This is the highest citrulline dose of any pump product on our shelf, and the formula behind it has changed meaningfully — including one ingredient that was removed for good reason.10g of pure citrulline — the highest we stockThe current formula uses pure L-citrulline, not citrulline malate. That distinction is worth doing the arithmetic on, because the older version of this very product illustrates it perfectly.Citrulline malate is citrulline bonded to malic acid at roughly 2:1, so the old formula's 6g of citrulline malate delivered around 4g of actual citrulline. The current 10g of pure citrulline delivers 10g.That is two and a half times the active ingredient — from a label that superficially looks like a moderate increase. Whenever you compare pump products, check which form is listed before comparing numbers.The researched range for pump and endurance is 6 to 8g, so 10g is generous rather than merely adequate.⚠ L-Norvaline has been removed — and that is a good thingThe older Nitr-Ox formula contained L-norvaline, and it is worth explaining why it is gone, because a lot of older reviews still praise it.L-norvaline was included as an arginase inhibitor — arginase is the enzyme that breaks arginine down, so inhibiting it extends nitric oxide elevation. The mechanism is sound, and it is the same job agmatine does in NovaPump Neuro.The concern is safety. Published laboratory research examining L-norvaline in cultured neuronal cells found signs of toxicity at concentrations that were not especially high. That work was in vitro — cell culture, not humans — so it does not establish harm from supplement use, and the human relevance is genuinely unclear.But the industry response was telling: many formulators quietly removed L-norvaline from their products, and Project AD are among them.We think that is the right call. There are arginase inhibitors — agmatine among them — without that question hanging over them. If you have an older tub of Nitr-Ox containing L-norvaline, that is worth knowing.Glycerol, and what the yield meansThe pump blend includes glycerol, which works on an entirely different mechanism from citrulline.Citrulline widens blood vessels. Glycerol pulls water into muscle cells. Blood flow and cell volumisation are separate things, and covering both is why this produces fullness as well as vascularity.Glycerol is an osmolyte — it relocates water rather than creating it. So hydration determines whether it works at all. Be well hydrated before training and keep drinking through the session, or you are wasting the ingredient.Note on powdered glycerol: forms like HydroMax and GlycerPump are typically 65% yield, since glycerol needs a carrier to exist as a stable powder. Our liquid Pump Script delivers 23g of actual glycerol for comparison — a different scale of dose entirely, and a different product for a different purpose.The electrolytes are properly dosedThis is an underrated part of the current formula: Sodium275mg (from sea salt) Potassium240mg (phosphate and aspartate) Calcium75mg (calcium citrate)These are not decoration. Sodium is the primary electrolyte governing fluid balance, and it helps hold water where glycerol has drawn it. Potassium is the main intracellular electrolyte and matters for muscular contraction. Calcium is directly involved in the contraction mechanism itself.Most pump products ignore electrolytes entirely, which is odd given the whole category works by moving fluid around.Specs (21.8g serving) Nitri-OX Pump Blend16,250mg L-Citrulline10,000mg (pure) GlycerolIncluded in blend Sodium275mg Potassium240mg Calcium75mg StimulantsNone SugarNone Servings20Honest note: the 16,250mg figure is a blend total. 10,000mg of it is citrulline, which leaves roughly 6,250mg for glycerol and the remaining pump ingredients. Individual doses within that are not fully broken out, so this is not quite the full disclosure the headline number suggests.Where it sits among our pump products NITR-OX10g pure citrulline + glycerolHighest citrulline. Best electrolytes GHOST Pump V26g citrulline + 3g arginine nitrateTwo NO pathways, including nitrates NovaPump Neuro8g citrulline malate + GlycerPumpFour NO mechanisms plus nootropics Pump Script23g liquid glycerolCell volumisation specialistNITR-OX is the citrulline play — if nitric oxide is what you want and you want it at a generous dose, this is the one. Pump Script delivers far more glycerol if muscle fullness specifically is the goal. GHOST Pump adds the separate nitrate pathway. NovaPump Neuro adds focus.These stack sensibly with each other where the mechanisms differ — though there is no point running two citrulline products.Stim-free is the practical advantageNo caffeine means this adds nothing to your daily stimulant total, so it works: Late in the evening, where a stimulant pre-workout would cost you sleep Stacked with any pre-workout you already use On deload weeks, keeping the pump without escalating stimulant tolerance For anyone who cannot take stimulants — sensitivity, a cardiovascular condition, medication, or preferenceHow to take it One scoop in 10 to 16oz of water, 20 to 30 minutes before training. Use the higher end of that range — the glycerol works better with more fluid. Be well hydrated beforehand and keep drinking through the session. Stacks with any stimulant pre-workout. Do not add another citrulline product. 10g is already a full dose. Endurance athletes: consider half a scoop. Sustained vasodilation over long cardio can produce uncomfortable tissue swelling — the same caveat as our MVPre 365 page.Who this is for Anyone who wants the largest citrulline dose available — 10g pure is the highest we stock People training late who still want pumps Anyone stacking with a pre-workout they already like People who sweat heavily, given the electrolyte content Bodybuilders wanting both vascularity and fullness — two mechanisms in one product Anyone stimulant-intolerant for any reasonWho this is not forIf you want energy, there are no stimulants here at all. A pump is not the same as feeling switched on.If your pre-workout already contains 8 to 10g of citrulline — MVPre 3.0 and DEFY both do — adding this is largely redundant.If cell volumisation specifically is your goal, Pump Script delivers far more glycerol.If you have an older tub containing L-norvaline, see the note above.Endurance athletes should use half a scoop.Not for anyone under 18, pregnant or nursing. Speak to your doctor before use if you take blood pressure medication — several ingredients here affect vasodilation.Stack it with: your usual stimulant pre-workout, or creatine. See our creatine range.Frequently asked questionsHow much citrulline is in NITR-OX?10,000mg of pure L-citrulline in the current formula — the highest of any pump product we stock. The older formula used 6g of citrulline malate, which delivered only around 4g of actual citrulline.Why was L-norvaline removed?Published laboratory research on cultured neuronal cells raised toxicity concerns. That work was in vitro rather than in humans, so it does not establish harm from supplement use — but many formulators removed it, and we think that was the right call.What does the glycerol do?It draws water into muscle cells for fullness — a different mechanism from citrulline, which widens blood vessels. It relocates fluid rather than creating it, so hydration determines whether it works.Does it contain stimulants?None at all, which is why it can be taken late in the evening or stacked with any pre-workout.Why are there electrolytes in it?Sodium helps hold water where the glycerol has drawn it, potassium supports muscular contraction, and calcium is directly involved in the contraction mechanism. Most pump products skip them entirely.Can I stack it with my pre-workout?Yes, provided your pre-workout does not already carry a large citrulline dose.Is the label fully disclosed?Partly. Citrulline is stated at 10,000mg, but the remaining ingredients sit inside a 16,250mg blend total without individual breakdowns.Should endurance athletes take a full scoop?Probably not. Sustained vasodilation over long cardio sessions can cause uncomfortable tissue swelling. Half a scoop is sensible. Read more

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Project AD NITR-OX

10 grams of pure L-citrulline plus glycerol and a full electrolyte panel, in a 16,250mg pump blend. Completely stimulant-free, and designed to stack with anything.

This is the highest citrulline dose of any pump product on our shelf, and the formula behind it has changed meaningfully — including one ingredient that was removed for good reason.

10g of pure citrulline — the highest we stock

The current formula uses pure L-citrulline, not citrulline malate. That distinction is worth doing the arithmetic on, because the older version of this very product illustrates it perfectly.

Citrulline malate is citrulline bonded to malic acid at roughly 2:1, so the old formula's 6g of citrulline malate delivered around 4g of actual citrulline. The current 10g of pure citrulline delivers 10g.

That is two and a half times the active ingredient — from a label that superficially looks like a moderate increase. Whenever you compare pump products, check which form is listed before comparing numbers.

The researched range for pump and endurance is 6 to 8g, so 10g is generous rather than merely adequate.

⚠ L-Norvaline has been removed — and that is a good thing

The older Nitr-Ox formula contained L-norvaline, and it is worth explaining why it is gone, because a lot of older reviews still praise it.

L-norvaline was included as an arginase inhibitor — arginase is the enzyme that breaks arginine down, so inhibiting it extends nitric oxide elevation. The mechanism is sound, and it is the same job agmatine does in NovaPump Neuro.

The concern is safety. Published laboratory research examining L-norvaline in cultured neuronal cells found signs of toxicity at concentrations that were not especially high. That work was in vitro — cell culture, not humans — so it does not establish harm from supplement use, and the human relevance is genuinely unclear.

But the industry response was telling: many formulators quietly removed L-norvaline from their products, and Project AD are among them.

We think that is the right call. There are arginase inhibitors — agmatine among them — without that question hanging over them. If you have an older tub of Nitr-Ox containing L-norvaline, that is worth knowing.

Glycerol, and what the yield means

The pump blend includes glycerol, which works on an entirely different mechanism from citrulline.

Citrulline widens blood vessels. Glycerol pulls water into muscle cells. Blood flow and cell volumisation are separate things, and covering both is why this produces fullness as well as vascularity.

Glycerol is an osmolyte — it relocates water rather than creating it. So hydration determines whether it works at all. Be well hydrated before training and keep drinking through the session, or you are wasting the ingredient.

Note on powdered glycerol: forms like HydroMax and GlycerPump are typically 65% yield, since glycerol needs a carrier to exist as a stable powder. Our liquid Pump Script delivers 23g of actual glycerol for comparison — a different scale of dose entirely, and a different product for a different purpose.

The electrolytes are properly dosed

This is an underrated part of the current formula:

Sodium	275mg (from sea salt)
Potassium	240mg (phosphate and aspartate)
Calcium	75mg (calcium citrate)

These are not decoration. Sodium is the primary electrolyte governing fluid balance, and it helps hold water where glycerol has drawn it. Potassium is the main intracellular electrolyte and matters for muscular contraction. Calcium is directly involved in the contraction mechanism itself.

Most pump products ignore electrolytes entirely, which is odd given the whole category works by moving fluid around.

Specs (21.8g serving)

Nitri-OX Pump Blend	16,250mg
L-Citrulline	10,000mg (pure)
Glycerol	Included in blend
Sodium	275mg
Potassium	240mg
Calcium	75mg
Stimulants	None
Sugar	None
Servings	20

Honest note: the 16,250mg figure is a blend total. 10,000mg of it is citrulline, which leaves roughly 6,250mg for glycerol and the remaining pump ingredients. Individual doses within that are not fully broken out, so this is not quite the full disclosure the headline number suggests.

Where it sits among our pump products

NITR-OX	10g pure citrulline + glycerol	Highest citrulline. Best electrolytes
GHOST Pump V2	6g citrulline + 3g arginine nitrate	Two NO pathways, including nitrates
NovaPump Neuro	8g citrulline malate + GlycerPump	Four NO mechanisms plus nootropics
Pump Script	23g liquid glycerol	Cell volumisation specialist

NITR-OX is the citrulline play — if nitric oxide is what you want and you want it at a generous dose, this is the one. Pump Script delivers far more glycerol if muscle fullness specifically is the goal. GHOST Pump adds the separate nitrate pathway. NovaPump Neuro adds focus.

These stack sensibly with each other where the mechanisms differ — though there is no point running two citrulline products.

Stim-free is the practical advantage

No caffeine means this adds nothing to your daily stimulant total, so it works:

Late in the evening, where a stimulant pre-workout would cost you sleep
Stacked with any pre-workout you already use
On deload weeks, keeping the pump without escalating stimulant tolerance
For anyone who cannot take stimulants — sensitivity, a cardiovascular condition, medication, or preference

How to take it

One scoop in 10 to 16oz of water, 20 to 30 minutes before training. Use the higher end of that range — the glycerol works better with more fluid.
Be well hydrated beforehand and keep drinking through the session.
Stacks with any stimulant pre-workout.
Do not add another citrulline product. 10g is already a full dose.
Endurance athletes: consider half a scoop. Sustained vasodilation over long cardio can produce uncomfortable tissue swelling — the same caveat as our MVPre 365 page.

Who this is for

Anyone who wants the largest citrulline dose available — 10g pure is the highest we stock
People training late who still want pumps
Anyone stacking with a pre-workout they already like
People who sweat heavily, given the electrolyte content
Bodybuilders wanting both vascularity and fullness — two mechanisms in one product
Anyone stimulant-intolerant for any reason

Who this is not for

If you want energy, there are no stimulants here at all. A pump is not the same as feeling switched on.

If your pre-workout already contains 8 to 10g of citrulline — MVPre 3.0 and DEFY both do — adding this is largely redundant.

If cell volumisation specifically is your goal, Pump Script delivers far more glycerol.

If you have an older tub containing L-norvaline, see the note above.

Endurance athletes should use half a scoop.

Not for anyone under 18, pregnant or nursing. Speak to your doctor before use if you take blood pressure medication — several ingredients here affect vasodilation.

Stack it with: your usual stimulant pre-workout, or creatine. See our creatine range.

Frequently asked questions

How much citrulline is in NITR-OX?
10,000mg of pure L-citrulline in the current formula — the highest of any pump product we stock. The older formula used 6g of citrulline malate, which delivered only around 4g of actual citrulline.

Why was L-norvaline removed?
Published laboratory research on cultured neuronal cells raised toxicity concerns. That work was in vitro rather than in humans, so it does not establish harm from supplement use — but many formulators removed it, and we think that was the right call.

What does the glycerol do?
It draws water into muscle cells for fullness — a different mechanism from citrulline, which widens blood vessels. It relocates fluid rather than creating it, so hydration determines whether it works.

Does it contain stimulants?
None at all, which is why it can be taken late in the evening or stacked with any pre-workout.

Why are there electrolytes in it?
Sodium helps hold water where the glycerol has drawn it, potassium supports muscular contraction, and calcium is directly involved in the contraction mechanism. Most pump products skip them entirely.

Can I stack it with my pre-workout?
Yes, provided your pre-workout does not already carry a large citrulline dose.

Is the label fully disclosed?
Partly. Citrulline is stated at 10,000mg, but the remaining ingredients sit inside a 16,250mg blend total without individual breakdowns.

Should endurance athletes take a full scoop?
Probably not. Sustained vasodilation over long cardio sessions can cause uncomfortable tissue swelling. Half a scoop is sensible.