NutraBio Leg Day carbohydrate powder, front of container

NutraBio Leg Day — 25g Cluster Dextrin + 10g EAAs, Stim-Free Intra-Workout

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NutraBio Leg Day — 25g Cluster Dextrin + 10g EAAs, Stim-Free Intra-Workout

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NutraBio Leg DayA stimulant-free intra-workout built for long, genuinely hard sessions: 30g of carbohydrate — 25g of it Cluster Dextrin — alongside 10g of full-spectrum EAAs, electrolytes, and nine patented ingredients. Fully disclosed.The clearest way to understand Leg Day is against NutraBio's other two products, because it is essentially both of them combined.Leg Day is Intra Blast plus Super Carb Intra Blast10g EAAs, 5g glutamine, betaineNo carbohydrate at all Super Carb25g Cluster Dextrin + electrolytesNo aminos Leg DayBoth, plus elevATP, NeuroFactor and mucunaThe combined productThat gives you a genuine choice. You can buy Leg Day as one tub, or buy Intra Blast and Super Carb separately — which costs more up front but lets you vary the carbohydrate independently of the aminos. On a light day you might want 10g of EAAs and no carbs at all; on a two-hour session you might want double the carbs.Buy Leg Day if you want simplicity. Buy the two separately if you want control. Both are reasonable, and we would rather explain the trade-off than push the bigger tub.Why Cluster Dextrin rather than ordinary carbsThis is the ingredient that makes drinking 30g of carbohydrate mid-session comfortable, and the reason comes down to one principle.Osmolality counts the number of dissolved particles, not their size. 25g of glucose is an enormous number of small molecules — high osmolality. 25g of a high-molecular-weight polymer like Cluster Dextrin is a fraction of that particle count.Why that matters: a high-osmolality solution actually draws water into your gut and slows stomach emptying. That is what causes the sloshing and cramping people associate with sports drinks. Cluster Dextrin's low osmolality means it clears the stomach quickly and gets to work.Cluster Dextrin (highly branched cyclic dextrin) is made from amylopectin using a process that produces long glucose chains with a narrow molecular weight distribution — high molecular weight, consistent structure, very low osmotic load.Full explanation on our Karbolyn page, which is the deep dive on performance carbohydrates.10g of full-spectrum EAAs, not just BCAAsAll nine essential amino acids, including roughly 7.25g of BCAAs at a 2:1:1 ratio.That distinction matters. Building muscle protein requires all nine essential aminos — supplying only the three BCAAs is like delivering three of nine components and expecting assembly to continue. NutraBio supply the full spectrum, which is the right approach for something you are sipping through a session.The BCAAs are naturally fermented and HPLC-tested, which is NutraBio's standard across their range.The hydration blend is properly built Coconut water powder (CocoPure) — a natural source of potassium, the primary intracellular electrolyte Albion minerals — chelated forms, which are generally better absorbed than cheaper mineral saltsThis matters more than it sounds for a long session. Sodium and potassium govern fluid balance and muscular contraction, and you lose both through sweat. A drink you sip for ninety minutes is the right vehicle for replacing them.The performance additions elevATP — a blend of ancient peat and apple extract, studied in relation to raising the body's own ATP production. Worth distinguishing from swallowing ATP directly, which does not work — ATP is broken down in digestion. We explain that fully on our Heavy Duty page NeuroFactor — a whole coffee fruit extract studied in relation to BDNF, brain-derived neurotrophic factor. Note there is no caffeine in Leg Day, and NeuroFactor is not a stimulant — it is a nootropic that works alongside caffeine, which is why this is designed to stack with your pre-workout rather than replace it Betaine anhydrous — associated with strength and power output Taurine — cell volumisation and hydration AstraGin — absorption enhancer⚠ Two things to check before buyingIt contains tree nuts. The coconut water powder makes this unsuitable for anyone with a coconut or tree nut allergy — genuinely unexpected in an intra-workout, and easy to miss.It contains mucuna pruriens standardised to 98% L-DOPA. L-DOPA is a direct dopamine precursor, and it can interact with MAOIs and other psychiatric medications. If you take antidepressants or any psychiatric medication, speak to your doctor before using this.Specs Carbohydrate30g total, 25g from Cluster Dextrin EAAs10g full spectrum BCAAs~7.25g at 2:1:1 Also containsBetaine, taurine, elevATP, NeuroFactor, AstraGin, CocoPure, Albion minerals, mucuna pruriens Patented ingredients9 StimulantsNone ColouringBlue spirulina — no artificial dyes Servings20 ⚠ AllergenTree nuts (coconut) LabelFully disclosed, flavouring quantities includedNutraBio disclose the flavouring amounts too — citric acid, natural flavour, malic acid, sucralose and acesulfame potassium all listed with milligram quantities. Almost nobody does that, and it is characteristic of the brand.Do you actually need carbohydrate during training?Worth asking, because the answer is often no.For a 45 to 60 minute resistance session, you do not. Muscle glycogen comfortably covers that, and your meals refill it. Adding 30g of carbohydrate to a session that did not need it is simply extra calories.Where Leg Day genuinely earns its place: Sessions beyond about 90 minutes, where glycogen becomes limiting Genuine leg days — high-volume squat and deadlift work is far more glycogen-demanding than an upper body session Two sessions in a day, where refilling quickly matters Training in a deficit, where total daily carbohydrate is low and intra-workout fuel preserves output Endurance work, field sports and combat sport campsIf none of those describe your training, Intra Blast gives you the amino and electrolyte side without the carbohydrate.How to take it One to two scoops in 32 to 64oz of cold water. That is a lot of fluid, and deliberately so. Drink about a third 20 minutes before training, then sip the rest through the session. Stimulant-free, so it stacks with any pre-workout — which is how it is designed to be used. Also usable pre or post-workout if you would rather take it in one go. Not on a rest day unless you specifically want the carbohydrate.Who this is for Anyone doing genuinely long or high-volume sessions — the name is accurate, leg training is where this makes most sense Athletes doing two sessions a day People training in a deficit who need intra-workout fuel to hold output Anyone who wants aminos, carbs and electrolytes in one product rather than three People who want a fully disclosed label — NutraBio go further than almost anyoneWho this is not forAnyone with a coconut or tree nut allergy.Anyone on psychiatric medication, without speaking to a doctor about the mucuna.If your sessions are under an hour, you probably do not need the carbohydrate. Intra Blast is the same brand without it.If you are cutting and counting calories closely, 30g of carbohydrate is around 120 calories you may not want.If you want control over carb and amino doses independently, buy Intra Blast and Super Carb separately.Not for anyone under 18, pregnant or nursing.Stack it with: your usual pre-workout — it is stimulant-free and the NeuroFactor is designed to work alongside caffeine.Frequently asked questionsHow is Leg Day different from Intra Blast?Intra Blast has no carbohydrate. Leg Day adds 30g — 25g of it Cluster Dextrin — plus elevATP, NeuroFactor and mucuna. It is essentially Intra Blast and Super Carb combined.What is Cluster Dextrin?A highly branched cyclic dextrin made from amylopectin. Its high molecular weight gives it very low osmolality, so it clears the stomach quickly without the cramping that ordinary sugars cause.Does it contain caffeine?None. It is stimulant-free and designed to stack with your pre-workout. The NeuroFactor is a nootropic, not a stimulant.Does it have all nine essential amino acids?Yes, 10g of full-spectrum EAAs including roughly 7.25g of BCAAs — not a BCAA-only product.What allergens does it contain?Tree nuts, from the coconut water powder. Unexpected in an intra-workout, so worth checking if you have a coconut allergy.Can I take it with antidepressants?Speak to your doctor. It contains mucuna pruriens standardised to 98% L-DOPA, a dopamine precursor that can interact with psychiatric medication.Do I need carbs during a workout?Generally not for sessions under an hour — glycogen covers that. Carbohydrate earns its place beyond about 90 minutes, on high-volume leg days, with two-a-days, or when training in a deficit.How much water should I use?32 to 64 ounces. Drink about a third before training and sip the rest through the session. Read more

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PRODUCT LABEL

NutraBio Leg Day

A stimulant-free intra-workout built for long, genuinely hard sessions: 30g of carbohydrate — 25g of it Cluster Dextrin — alongside 10g of full-spectrum EAAs, electrolytes, and nine patented ingredients. Fully disclosed.

The clearest way to understand Leg Day is against NutraBio's other two products, because it is essentially both of them combined.

Leg Day is Intra Blast plus Super Carb

Intra Blast	10g EAAs, 5g glutamine, betaine	No carbohydrate at all
Super Carb	25g Cluster Dextrin + electrolytes	No aminos
Leg Day	Both, plus elevATP, NeuroFactor and mucuna	The combined product

That gives you a genuine choice. You can buy Leg Day as one tub, or buy Intra Blast and Super Carb separately — which costs more up front but lets you vary the carbohydrate independently of the aminos. On a light day you might want 10g of EAAs and no carbs at all; on a two-hour session you might want double the carbs.

Buy Leg Day if you want simplicity. Buy the two separately if you want control. Both are reasonable, and we would rather explain the trade-off than push the bigger tub.

Why Cluster Dextrin rather than ordinary carbs

This is the ingredient that makes drinking 30g of carbohydrate mid-session comfortable, and the reason comes down to one principle.

Osmolality counts the number of dissolved particles, not their size. 25g of glucose is an enormous number of small molecules — high osmolality. 25g of a high-molecular-weight polymer like Cluster Dextrin is a fraction of that particle count.

Why that matters: a high-osmolality solution actually draws water into your gut and slows stomach emptying. That is what causes the sloshing and cramping people associate with sports drinks. Cluster Dextrin's low osmolality means it clears the stomach quickly and gets to work.

Cluster Dextrin (highly branched cyclic dextrin) is made from amylopectin using a process that produces long glucose chains with a narrow molecular weight distribution — high molecular weight, consistent structure, very low osmotic load.

Full explanation on our Karbolyn page, which is the deep dive on performance carbohydrates.

10g of full-spectrum EAAs, not just BCAAs

All nine essential amino acids, including roughly 7.25g of BCAAs at a 2:1:1 ratio.

That distinction matters. Building muscle protein requires all nine essential aminos — supplying only the three BCAAs is like delivering three of nine components and expecting assembly to continue. NutraBio supply the full spectrum, which is the right approach for something you are sipping through a session.

The BCAAs are naturally fermented and HPLC-tested, which is NutraBio's standard across their range.

The hydration blend is properly built

Coconut water powder (CocoPure) — a natural source of potassium, the primary intracellular electrolyte
Albion minerals — chelated forms, which are generally better absorbed than cheaper mineral salts

This matters more than it sounds for a long session. Sodium and potassium govern fluid balance and muscular contraction, and you lose both through sweat. A drink you sip for ninety minutes is the right vehicle for replacing them.

The performance additions

elevATP — a blend of ancient peat and apple extract, studied in relation to raising the body's own ATP production. Worth distinguishing from swallowing ATP directly, which does not work — ATP is broken down in digestion. We explain that fully on our Heavy Duty page
NeuroFactor — a whole coffee fruit extract studied in relation to BDNF, brain-derived neurotrophic factor. Note there is no caffeine in Leg Day, and NeuroFactor is not a stimulant — it is a nootropic that works alongside caffeine, which is why this is designed to stack with your pre-workout rather than replace it
Betaine anhydrous — associated with strength and power output
Taurine — cell volumisation and hydration
AstraGin — absorption enhancer

⚠ Two things to check before buying

It contains tree nuts. The coconut water powder makes this unsuitable for anyone with a coconut or tree nut allergy — genuinely unexpected in an intra-workout, and easy to miss.

It contains mucuna pruriens standardised to 98% L-DOPA. L-DOPA is a direct dopamine precursor, and it can interact with MAOIs and other psychiatric medications. If you take antidepressants or any psychiatric medication, speak to your doctor before using this.

Specs

Carbohydrate	30g total, 25g from Cluster Dextrin
EAAs	10g full spectrum
BCAAs	~7.25g at 2:1:1
Also contains	Betaine, taurine, elevATP, NeuroFactor, AstraGin, CocoPure, Albion minerals, mucuna pruriens
Patented ingredients	9
Stimulants	None
Colouring	Blue spirulina — no artificial dyes
Servings	20
⚠ Allergen	Tree nuts (coconut)
Label	Fully disclosed, flavouring quantities included

NutraBio disclose the flavouring amounts too — citric acid, natural flavour, malic acid, sucralose and acesulfame potassium all listed with milligram quantities. Almost nobody does that, and it is characteristic of the brand.

Do you actually need carbohydrate during training?

Worth asking, because the answer is often no.

For a 45 to 60 minute resistance session, you do not. Muscle glycogen comfortably covers that, and your meals refill it. Adding 30g of carbohydrate to a session that did not need it is simply extra calories.

Where Leg Day genuinely earns its place:

Sessions beyond about 90 minutes, where glycogen becomes limiting
Genuine leg days — high-volume squat and deadlift work is far more glycogen-demanding than an upper body session
Two sessions in a day, where refilling quickly matters
Training in a deficit, where total daily carbohydrate is low and intra-workout fuel preserves output
Endurance work, field sports and combat sport camps

If none of those describe your training, Intra Blast gives you the amino and electrolyte side without the carbohydrate.

How to take it

One to two scoops in 32 to 64oz of cold water. That is a lot of fluid, and deliberately so.
Drink about a third 20 minutes before training, then sip the rest through the session.
Stimulant-free, so it stacks with any pre-workout — which is how it is designed to be used.
Also usable pre or post-workout if you would rather take it in one go.
Not on a rest day unless you specifically want the carbohydrate.

Who this is for

Anyone doing genuinely long or high-volume sessions — the name is accurate, leg training is where this makes most sense
Athletes doing two sessions a day
People training in a deficit who need intra-workout fuel to hold output
Anyone who wants aminos, carbs and electrolytes in one product rather than three
People who want a fully disclosed label — NutraBio go further than almost anyone

Who this is not for

Anyone with a coconut or tree nut allergy.

Anyone on psychiatric medication, without speaking to a doctor about the mucuna.

If your sessions are under an hour, you probably do not need the carbohydrate. Intra Blast is the same brand without it.

If you are cutting and counting calories closely, 30g of carbohydrate is around 120 calories you may not want.

If you want control over carb and amino doses independently, buy Intra Blast and Super Carb separately.

Not for anyone under 18, pregnant or nursing.

Stack it with: your usual pre-workout — it is stimulant-free and the NeuroFactor is designed to work alongside caffeine.

Frequently asked questions

How is Leg Day different from Intra Blast?
Intra Blast has no carbohydrate. Leg Day adds 30g — 25g of it Cluster Dextrin — plus elevATP, NeuroFactor and mucuna. It is essentially Intra Blast and Super Carb combined.

What is Cluster Dextrin?
A highly branched cyclic dextrin made from amylopectin. Its high molecular weight gives it very low osmolality, so it clears the stomach quickly without the cramping that ordinary sugars cause.

Does it contain caffeine?
None. It is stimulant-free and designed to stack with your pre-workout. The NeuroFactor is a nootropic, not a stimulant.

Does it have all nine essential amino acids?
Yes, 10g of full-spectrum EAAs including roughly 7.25g of BCAAs — not a BCAA-only product.

What allergens does it contain?
Tree nuts, from the coconut water powder. Unexpected in an intra-workout, so worth checking if you have a coconut allergy.

Can I take it with antidepressants?
Speak to your doctor. It contains mucuna pruriens standardised to 98% L-DOPA, a dopamine precursor that can interact with psychiatric medication.

Do I need carbs during a workout?
Generally not for sessions under an hour — glycogen covers that. Carbohydrate earns its place beyond about 90 minutes, on high-volume leg days, with two-a-days, or when training in a deficit.

How much water should I use?
32 to 64 ounces. Drink about a third before training and sip the rest through the session.