25g Cluster Dextrin®, 7.6g aminos, patented leg day support
Intra Fuel Leg Day is a straight-up, no-BS intra-workout focused on performance. The idea is simple: if your workout is long, intense, and burns a ton of energy, you need more than just flavor and hype. This one has a fully open label—no hidden blends—and mixes fast carbs, key aminos, hydration minerals, and stim-free boosters to keep you going strong after the easy stuff is done. That's spot on for leg days, big volume sessions, and conditioning where power and focus usually tank in the back half.
The star is 25g of Cluster Dextrin®, a highly branched cyclic dextrin that's super friendly for athletes. Its low osmolality means it clears your stomach quick and goes down easy during training, unlike heavier carbs that can leave you feeling bloated. In the gym, that translates to steady energy and less fading on later sets. Backing it up is a hefty amino setup: 2,500mg leucine, 1,250mg isoleucine, and 1,250mg valine for the classic 2:1:1 BCAA ratio, plus lysine, threonine, histidine, methionine, phenylalanine, tryptophan, and ornithine to make it more than just a basic BCAA sip. That 2.5g leucine is key—it's the low end of what's shown to kick off mTOR signaling, which is your body's way of starting muscle repair. The other EAAs fill in the gaps that BCAAs can't handle alone.
Hydration is smartly stacked too. 2,000mg taurine is a solid dose for keeping cells hydrated and balanced, which helps your muscles work better without cramping. Then there's pink Himalayan salt, CocoPure™ coconut water powder, Calci-K® calcium potassium phosphate citrate, and Albion® di-magnesium
Key Highlights
- 25,000mg Cluster Dextrin® — a big carb hit from highly branched cyclic dextrin, known for low osmolality (that means it doesn't sit heavy in your gut) and quick stomach emptying. You get fast fuel without the sloshy bloat, keeping energy steady in long, tough workouts.
- 7.6g total amino support with 5g BCAAs — way beyond a basic flavored BCAA. It's got 2,500mg leucine, 1,250mg isoleucine, and 1,250mg valine, plus extra EAAs and helpers to really protect muscles and aid recovery during training.
- 2,500mg leucine — hits the low end of doses that fire up mTOR activation for muscle repair signals. Leucine's the boss amino that tells your body to build and fix instead of just tearing down from hard sets.
- 2,000mg taurine — a real dose for cell hydration, balance, and muscle work. This makes the formula feel more reliable and less likely to cramp than simple carb drinks with weak hydration.
- 150mg elevATP® — the exact dose from studies showing boosts in lower-body strength, power, and your body's own ATP production. Most intras skip this, but it's a game-changer at full strength.
- 100mg NeuroFactor® — the full dose from studies on whole coffee fruit extract that ups plasma BDNF (a brain growth factor). Basically, sharper focus and better workout mental game without loading up on stims.
- 50mg Senactiv® — full clinical dose, not a tiny bit. Studies show it helps with recovery after exercise, refilling glycogen, ATP enzymes, and muscle repair signals—perfect for an intra built for back-to-back performance.
- Electrolyte system, not token pixie dust — Calci-K®, pink Himalayan salt, magnesium, phosphorus, and CocoPure™ cover sodium, potassium, calcium, phosphate, and magnesium for real hydration and muscle contractions. Beats a label with just one sodium stat.
Who Is This For?
- Bodybuilders and physique folks grinding high-volume leg days where things fade after big lifts. 25g Cluster Dextrin® fuels up, leucine aminos and 2g taurine keep output, fullness, and hydration going strong.
- Strength lifters in build-up phases with long sets of squats, deads, machines, extras over 60-90 minutes. 150mg elevATP® plus carbs and electrolytes fight glycogen drop and fatigue on lower body.
- CrossFit and hybrid trainers needing intra for high-effort repeats and muscle recovery without big stims. Cluster Dextrin®, taurine, electrolytes, Senactiv® hold work capacity steady in circuits and mixes.
- Evening gym rats wanting boosts without caffeine killing sleep. Focuses on fuel, ATP, hydration, brain stuff over stims, better for late sessions than heavy pre-workouts.
- Cutters keeping calories low but wanting full, productive training. Carb dose is smart, not overkill, aminos fight breakdown on longer hauls.
- Fasted or low-fuel trainers who get weak, shaky, mentally off mid-workout. Quick carbs, electrolytes, aminos fix that by feeding during instead of winging it.
How to Use
Mix one scoop in plenty of cold water and sip starting pre or early sets. Timing fits because 25g Cluster Dextrin® fuels during the workout, electrolytes and taurine help as sweat and fatigue build. If new to intra carbs or short sessions, try half to check gut feel and if you need the full hit. Add more water for milder taste and easy drinking; shaker keeps it mixed. Works with or without food, killer if pre-meal was light or missing. Stacks with stim pre or coffee—no big caffeine here, just watch total intake. Pair with daily creatine and post protein shake since this supports training, not full protein needs. No cycling needed like stim stuff; store sealed, dry, cool to avoid clumps.
What to Expect
First 5-10 minutes, it's practical: drinks light like a real intra, sits easy thanks to Cluster Dextrin®. By 10-20 minutes, hydration shines as taurine and electrolytes keep reps smooth, not flat, once you sweat. 20-45 minutes is prime: energy holds, pumps stay full, focus locks in better on leg stuff. 45-90 minutes, it's about not fading fast—that's intra done right. Week one, sessions feel more consistent, less mid-drop. Weeks 2-4, recovery flows better with steady fueling, Senactiv®, and elevATP® between hard days.
Frequently Asked Questions
What kind of product is NutraBio Intra Fuel Leg Day?
It is a fully disclosed intra-workout formula designed to be sipped around training, not a standard stimulant pre-workout. The formula centers on 25g Cluster Dextrin®, 7.6g total aminos, hydration minerals, taurine, and patented performance ingredients like elevATP®, NeuroFactor®, Senactiv®, and AstraGin®.
How much carbohydrate does Intra Fuel Leg Day provide per serving?
This formula provides 25g of Cluster Dextrin® highly branched cyclic dextrin per serving. That is a meaningful amount for supporting training energy during long or glycogen-demanding sessions, especially leg day, hypertrophy work, or conditioning blocks.
Is the amino profile just BCAAs?
No. You get 5g of BCAAs in a 2:1:1 ratio from 2,500mg leucine, 1,250mg isoleucine, and 1,250mg valine, but the formula also adds lysine, threonine, histidine, phenylalanine, methionine, tryptophan, and ornithine. That makes it more complete than a basic BCAA-only drink.
Does this product contain caffeine?
No clear caffeine amount is declared from the verified label data, and the formula is positioned as stim-free rather than caffeine-driven. NeuroFactor® is a coffee fruit extract, but it is used for BDNF-related cognitive support, not as a disclosed caffeine source.
When should I take NutraBio Intra Fuel Leg Day?
Start sipping it just before training or during your first working sets, then continue across the session. That timing lets the Cluster Dextrin®, electrolytes, taurine, and amino acids support performance while demand is building instead of after the workout is over.
Is elevATP® actually dosed effectively here?
Yes. elevATP® is included at 150mg, which matches the studied human dose associated with improved lower-body strength, power output, and endogenous ATP support. That is one of the more evidence-aligned parts of the formula.
What does Senactiv® add to an intra-workout?
Senactiv® at 50mg is the full branded dose used in research. It is included to support recovery and repeat performance through mechanisms tied to senescent cell clearance, glycogen restoration, ATP-related enzyme activity, and muscle regeneration signaling.
Can I use this with a separate pre-workout?
Yes, and that is one of the better ways to use it if you already have a pre-workout you like. Intra Fuel Leg Day handles the fuel, hydration, amino, and ATP-support side, while your pre-workout can cover pumps or stimulants if needed.
Is this a good choice for fasted training?
Yes, especially if fasted training leaves you flat or underpowered midway through the session. The 25g carb base plus amino acids and electrolytes can make a noticeable difference in workout quality when you do not have much pre-workout nutrition onboard.
Why is L-DOPA included in a leg day intra-workout?
L-DOPA from Mucuna pruriens is a dopamine precursor, so it is likely included to support drive, intent, and mental engagement during hard training. At 150mg it is better viewed as a supporting focus ingredient rather than the primary performance engine of the formula.
