NutraBio - Leg Day

NutraBio Leg Day: Complete Intra-Workout Powerhouse

NutraBio Leg Day is a fully loaded intra-workout supplement designed to fuel performance, protect muscle tissue, and optimize hydration simultaneously—making it one of the most comprehensive mid-session formulas available. With 30g of dual-source carbohydrates, 8.6g of full-spectrum amino acids, a four-ingredient patented performance matrix, and a complete electrolyte optimizer in every scoop, Leg Day covers every physiological demand of hard training in a single product.

At 47.37g per serving across 20 servings, this is not a light pixie-dust formula—it is a fully dosed, transparently labeled intra-workout built to support athletes who train hard enough actually to need what's inside.

Quick Specs

• Serving size: 1 scoop (47.37g) | 20 servings per container
• Calories per serving: 120 | Total carbohydrates: 31g
• Amino acids: 8.6g total (7.6g EAAs including 5g BCAAs in 2:1:1 ratio)
• Key blends: Dual Carb Energy (30g), Leg Day Performance Matrix (600mg), Intra Blast Amino Matrix (8.6g), Electrolyte Optimizer (3.97g), Nutrient Absorption Enhancer
• Patented/trademarked compounds: ClusterDextrin™, elevATP®, NeuroFactor®, Senactiv®, Calci-K™, Cocopure™, Albion™, Astragin™

Five Systems Working Together

The challenge with intra-workout supplementation is that the body needs energy, amino acids, hydration, focus, and performance support all at once—but most intra-workout products address only one or two of these at meaningful doses. Leg Day addresses all five simultaneously.

Dual Carbohydrate Energy System

ClusterDextrin™ (25g) and D-Ribose (5g) provide two distinct types of carbohydrate energy: ClusterDextrin™ offers rapid yet sustained glucose delivery with low osmolality (meaning less GI distress). At the same time, D-Ribose targets ATP replenishment directly—supporting the cellular energy currency that muscles burn during high-intensity sets.

Performance Enhancement Matrix

Four patented performance ingredients—Velvet Bean Extract (300mg), elevATP® (150mg), NeuroFactor® (100mg), and Senactiv® (50mg)—work in parallel to support dopamine-driven motivation, intracellular ATP production, cognitive focus, and muscle cell regeneration during the session itself.

Full-Spectrum Amino Acid Delivery

The Intra Blast Amino Matrix delivers 8.6g of amino acids, including all nine essential amino acids and an additional gram of L-Ornithine HCl. This complete EAA profile helps maintain muscle protein synthesis during training and supports recovery from the moment amino acids hit the bloodstream.

Electrolyte & Hydration Optimization

A comprehensive 3.97g electrolyte complex built around Taurine (2g), Calci-K™, Cocopure™ coconut water, Himalayan Pink Sea Salt, di-magnesium malate, and sodium phosphate covers every major electrolyte lost in sweat. At the same time, Taurine adds additional endurance and muscle contraction support beyond simple rehydration.

Enhanced Nutrient Absorption

Astragin™ (50mg) from astragalus and panax notoginseng is included specifically to help maximize the bioavailability and intestinal absorption of the amino acids, carbohydrates, and other active compounds in the formula—making every gram count.

Full Ingredient Breakdown

Dual Carbohydrate Energy Blend (30g)

• ClusterDextrin™ 25g (Highly Branched Cyclic Dextrin): Patented next-generation carbohydrate with high molecular weight and low osmolality—empties from the stomach rapidly without bloating, providing sustained glucose availability throughout training without the GI discomfort of maltodextrin or dextrose.
• D-Ribose 5g: A pentose sugar directly involved in ATP synthesis. Supplementing intra-workout with D-Ribose helps restore adenosine triphosphate during and after high-intensity efforts, supporting sustained power output across multiple sets.

Leg Day Performance Matrix (600mg)

• Velvet Bean Extract 300mg (Mucuna pruriens seed): Natural source of L-DOPA, the direct precursor to dopamine. Supports mood, motivation, and mental engagement during grueling sessions, helping athletes stay mentally present through the most demanding parts of training.
• elevATP® 150mg (Ancient peat & apple fruit extract): Patented compound from FutureCeuticals studied for its ability to help support intracellular ATP levels, with research noting improvements in strength, power output, and vertical jump performance in supplement studies.
• NeuroFactor® 100mg (Coffee berry extract, Coffea arabica fruit): Patented whole-coffee-fruit extract studied for its role in supporting Brain-Derived Neurotrophic Factor (BDNF) levels, promoting cognitive performance, focus, and mind-muscle connection during training.
• Senactiv® 50mg (Panax notoginseng root, Rosa roxburghii fruit): Patented adaptogen blend from NovaBay/NuLiv Science studied for its role in supporting energy production, muscle cell regeneration, and the removal of old, damaged muscle cells—promoting a faster renewal environment during and after exercise.

Intra Blast Amino Matrix (8.6g total — 7.6g EAAs, 5g BCAAs)

• L-Leucine 2,500mg: The primary BCAA driver of muscle protein synthesis, also activating the mTOR pathway for anabolic signaling.
• L-Isoleucine 1,250mg: Supports glucose uptake into muscle cells during exercise and contributes to endurance-related amino acid oxidation.
• L-Valine 1,250mg: Completes the 2:1:1 BCAA ratio alongside Leucine and Isoleucine to support anti-catabolic protection during training.
• L-Ornithine HCl 1,000mg: Supports the urea cycle to help clear ammonia buildup during intense training, promoting reduced fatigue and improved anaerobic capacity.
• L-Lysine HCl 850mg: Essential amino acid critical for protein synthesis and collagen cross-linking, supporting connective tissue repair alongside muscle recovery.
• L-Threonine 850mg: Essential amino acid supporting immune function and collagen formation, often underdosed or missing in BCAA-only products.
• L-Histidine HCl 450mg: Precursor to carnosine, helping buffer intramuscular acid accumulation during high-rep, high-intensity training.
• DL-Phenylalanine 300mg: Precursor to tyrosine, dopamine, and norepinephrine, supporting mood and focus under training stress.
• DL-Methionine 100mg: Sulfur-containing essential amino acid involved in protein synthesis and methylation processes.
• L-Tryptophan 55mg: Essential amino acid and serotonin precursor, supporting mood regulation during and after extended training sessions.

Electrolyte & Hydration Optimizer (3.97g)

• Taurine 2,000mg: Conditionally essential amino acid that supports intracellular hydration, muscle contraction efficiency, endurance, and oxidative stress reduction—a meaningful endurance compound, not just an electrolyte filler.
• Calcium Potassium Phosphate Citrate (Calci-K™) 667mg: Albion-patented mineral complex providing calcium, potassium, and phosphorus simultaneously to support muscle contractions, nerve signaling, and bone health.
• Coconut Water Powder (Cocopure™) 500mg: Natural electrolyte source rich in potassium and trace minerals for whole-food hydration support.
• Pink Himalayan Sea Salt 393mg: Natural sodium source supporting extracellular fluid balance, nerve conduction, and muscle function during heavy sweating.
• Di-Magnesium Malate (Albion™) 250mg: Patented highly bioavailable magnesium form supporting energy production (via the Krebs cycle) and muscle relaxation post-contraction.
• Sodium Phosphate 157mg: Additional phosphate source supporting ATP buffering and oxygen delivery during high-intensity efforts.

Nutrient Absorption Enhancer

• Astragin™ 50mg (Astragalus membranaceus root, Panax notoginseng root): Patented absorption-enhancing compound from NuLiv Science shown to help improve the intestinal uptake of amino acids and other key nutrients—maximizing the effective delivery of everything else in the formula.

Formula Synergy: Why Leg Day Works

The architecture of Leg Day is built around a straightforward principle: every physiological demand of intense training should be met simultaneously, not in separate products. The dual carbs keep glycogen topped off; amino acids protect and rebuild muscle tissue in real time; electrolytes maintain the fluid and mineral balance that directly impacts force output; the performance matrix extends ATP availability and cognitive drive; and Astragin™ ensures all of it actually gets absorbed.

The ClusterDextrin + D-Ribose Advantage

Most intra-workout carb products use a single carbohydrate source. Leg Day pairs ClusterDextrin™—which excels at sustained glucose delivery and rapid gastric emptying—with D-Ribose, which uniquely supports ATP production at the cellular level. One fuels the muscles from the bloodstream; the other fuels them from the mitochondria.

EAA vs BCAA-Only Products

BCAAs alone (leucine, isoleucine, valine) drive protein synthesis signaling but cannot complete the full protein synthesis process without all nine essential amino acids being present. Leg Day's 7.6g EAA profile ensures that when the anabolic signal fires during training, the complete amino acid pool is available to act on it—something a BCAA-only product cannot provide.

Complete Supplement Facts

About NutraBio

NutraBio has been producing fully transparent, clinically dosed supplements since 1996—no proprietary blends, no fillers, no shortcuts. Every formula is third-party tested and manufactured in its own FDA-inspected and cGMP-certified facility.

Explore the complete NutraBio lineup on our NutraBio collection page.

Recommended Use

Standard Protocol

Mix 1 scoop (47.37g) in 16–20 oz of cold water and sip throughout your training session. Leg Day is designed for intra-workout consumption, not for pre- or post-workout.

Timing Strategy

• Leg day & lower body sessions: The name says it all—this formula is purpose-built for high-volume, high-demand sessions where glycogen depletion, muscle fatigue, and hydration loss are greatest.
• Long upper body sessions: Any session exceeding 60–75 minutes where sustained energy and amino acid availability matter.
• Endurance & conditioning work: The carb + electrolyte combination makes it equally effective for metabolic conditioning, HIIT, and circuit training.

Stacking Notes

Leg Day pairs naturally with a pre-workout taken before training and a protein shake post-workout. Its EAA content complements rather than duplicates a post-workout shake, since it focuses on intra-session delivery rather than the larger protein dose needed for recovery.

Who Leg Day Is For

• Powerlifters & strength athletes: High-volume lower body sessions where glycogen depletion and fatigue are the primary limiters.
• Bodybuilders: Long training sessions require sustained amino acid availability, muscle fullness, and mental focus throughout every working set.
• CrossFit & functional fitness athletes: High-intensity, multi-modal training where carbs, aminos, and electrolytes are all depleted simultaneously.
• Endurance athletes: Those seeking a comprehensive mid-session fuel with amino acid protection beyond basic carb drinks.
• Anyone training fasted: The dual-carb system and full EAA profile make this especially valuable for those who cannot eat before training.

How Leg Day Compares

Complete Your Training Stack

• Intra-Workout Collection – All mid-session performance options.
• NutraBio Full Line – Explore all NutraBio formulas.
• Pre-Workout Collection – Prime your session before Leg Day.
• Protein Supplements – Post-workout recovery to finish what Leg Day started.

FDA Disclaimer & Warnings

The Food and Drug Administration has not evaluated these statements. This product is not intended to diagnose, treat, cure, or prevent any disease.

• Consult a healthcare professional before use if pregnant, nursing, under 18, or if you have a medical condition or are taking medication.
• Contains D-Ribose, an added sugar; suitable for those monitoring carbohydrate intake.
• Discontinue use if adverse reactions occur. Keep out of reach of children.
• Store in a cool, dry place away from heat and moisture.