Muscle Code Capsules

Muscle Code Capsules

 (10562 Reviews)
$39.99
$39.99 $44.99
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√ Up to 10X greater muscle synthesis than whey protein isolate, on gram for gram of product consumed

√ Patented EAA Formula – All 9 essential amino acids to support muscle protein synthesis and recovery

√ Rapid Absorption – 99% absorbed into the blood stream bypassing digestion

√ Clean & Dairy Free – vegan, non-GMO, gluten-free, lactose-free

√ NASA & NIH Funded Research – Developed by Dr. Robert Wolfe, a world leader in amino acid science.

√ Made in USA with globally sourced ingredients & Third-Party Tested – Manufactured in a GMP-certified and NSF certified facility for quality assurance.

√ Convenient & Mess friendly – Enjoy up to 3 servings a day, with 3 hour intervals

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Muscle Code Capsules

Muscle Code Capsules

$39.99
$39.99 $44.99
SAVE 11% Sold out
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  • Build Lean Muscle 

  • Backed by Clinical Research 

  • Advanced Amino Formula

  • Third Party Tested

  • Enhances Endurance

    Originally

    FUNDED BY NASA AND USED BY ASTRONAUTS 

    Faster Recovery

    Our patented formula helps you recover faster, and reduce soreness after workouts.

    Cellular Energy

    Supports natural energy production at the cellular level, helping fuel consistent, high-quality training sessions.

    Maintain Muscle

    Help Prevent Muscle Loss as you age.

    Patented Amino Formula

    Builds & Maintains Muscle 10x better than whey protein Isolate.

    Rapid Absorption

    Our advanced amino formula starts to work in less than 20 minutes.

    Endurance Support

    EAAs help delay fatigue and sustain energy during intense workouts, keeping your muscles performing longer.

     How it Works 

    Our advanced amino formula starts to work in less than 20 minutes — for faster, more efficient muscle building.

    check Build Strength — Stimulates rapid muscle protein synthesis 

    check_ Boost Endurance — Enhances amino acid delivery to working muscle 

    check Recover Fast — Rebuilds muscle quickly with high-efficiency EAAs 

    check Support Health — Helps maintain lean mass and physical function 

    Customers Love MUSCLE CODE 

    • I love it!

      "I feel better than ever. And my secret is Muscle Code."

      - Rio

    • Absolutely the best!

      "Now I'm building muscle fast, getting stronger,and looking younger."

      -Victoria

    • I feel great!

      "Muscle Code helps me look and feel younger."

       -Phil 

       Advanced Amino Acids 

      Clinically proven to fuel muscle growth, recovery, and performance — in just 3.6g per serving

      • NASA-Researched Formula - Developed by Dr. Robert Wolfe, world leader in amino acid science, based on research originally funded to protect astronauts' muscles in space.
      • More Effective Than Whey Protein - Clinically shown to match the muscle-building effects of 15g whey protein with only
 3.6g of essential amino acids.
      • Rapid Muscle Recovery & Strength - Promotes lean muscle growth, reduces soreness, and supports peak training performance.
      • Made in USA & Third-Party Tested - Produced in GMP-certified facilities to ensure purity, potency, and safety.

       Made with the best 

      The Science of Muscle Code & How it’s Made 

      What you can find in Muscle Code

      - Clinically Proven Amino Acids

      - Vegan & Clean Formula

      - Zero Sugar & No Artificial Flavors

      - Researched & Developed Backed by amino acid science

      - Made in a GMP-Certified Facility

      - Gluten Free, Dairy Free, Soy Free, Nut Free, Shellfish Free

      Dr. Smith Johnston 

      Dr. Smith Johnston is a leading expert in space medicine with more than 25 years as a NASA Flight Surgeon, where he cared for astronauts, supported over 25 Space Shuttle missions, and led medical systems for the ISS. As Medical Director at Johnson Space Center, he oversaw astronaut medical standards, fatigue management, and human performance programs. He now serves as Chief Medical Officer at Axiom Space, guiding crew health and readiness for private astronaut missions. Board-certified in Aerospace Medicine, he also teaches at the University of Texas Medical Branch and advises Timeshifter. His work has been widely recognized in media outlets including NOVA, Scientific American, and The New York Times.

      Aerospace Medicine Specialist

       Dr. Robert Wolfe 

      Dr. Robert Wolfe, a leading researcher in muscle metabolism, has spent decades uncovering the power of amino acids in human health. With a career rooted in clinical research and physiology, he became particularly intrigued by how the body repairs and builds muscle—especially in aging populations and athletes. His research led to a groundbreaking discovery: essential amino acids (EAAs) play a far more critical role than previously thought. Unlike complete proteins, EAAs could stimulate muscle protein synthesis rapidly, even without exercise. This had profound implications—not just for body builders, but for older adults losing muscle mass, patients recovering from surgery, and anyone looking to improve recovery and performance.

      The Amino Acid Pioneer

      Nautilus community 

      • Better recovery could be one habit away.

        Nautilus Muscle Code delivers all 9 essential amino acids to support muscle protein synthesis, recovery, and performance. 
        A few capsules a day can make a big difference in how you recover tomorrow.

      • Ring for recovery. 🔔

        Muscle Code delivers all 9 essential amino acids to support muscle recovery, maintenance, and performance—whenever your routine calls for it.

      • A Simple Morning Routine for Strength

        Aim for around 30g of protein in the morning, then add Muscle Code to your routine for all 9 essential amino acids.

        Protein provides important building blocks for your body, while essential amino acids help support muscle maintenance, muscle protein synthesis, and post-workout recovery.

        A simple daily habit to complement your nutrition and fitness routine.
        • The workout is just one part of the routine. Recovery is the other.
          Nautilus Muscle Code delivers all 9 essential amino acids to support muscle maintenance, recovery, and performance, so you’re ready for whatever’s next.
        • Built to meet you wherever you are in your fitness journey.

          From strength training and Pilates to running, recovery days, and everyday movement, Muscle Code is designed to support muscle maintenance, recovery, and performance through it all.
          However you move, make recovery part of the routine.
        • Happiness isn’t always found in the big moments. Sometimes it’s built through the rituals you keep.

          A few minutes set aside for yourself. A consistent workout. Your daily Muscle Code. Small habits have a way of adding up to something bigger.

          Science Backed Ingredients

          Key Ingredients 

          EAAlpha® Reginator Essential Amino Acids Capsule (3600 mg)

          check  L-Leucine 

          check  L-Lysine HCl 

          check  L-Valine 

          check  L-Isoleucine 

          check  L-Arginine 

          check  L-Threonine 

          check  L-Phenylalanine 

          check  L-Methionine 

          check  L-Histidine 

          check  L-Tryptophan 

          check  Vegetable Capsule 

          check  Vegetable Magnesium Stereate 

          check  Silicon Dioxide 

           Frequently Asked Questions 

          What is Muscle Code?

          Muscle Code by Nautilus is a patented, clinically proven essential amino acid (EAA) supplement formulated in the precise ratio your body needs to maximize protein synthesis.

          What makes Muscle Code different from other protein or amino acid supplements?

          Unlike generic amino blends or incomplete proteins, Muscle Code contains EAAs in the exact balance required for effective muscle protein synthesis. This ensures nothing is wasted, giving you better results with less effort.

          How does Muscle Code work to build muscle and aid recovery?

          Leucine triggers muscle protein synthesis, while the other EAAs provide the raw material for new muscle tissue. Together, they repair muscle damage and accelerate recovery.

          Who should take Muscle Code?

          · Athletes & fitness enthusiasts to maximize training gains

          · Aging adults to maintain lean muscle and strength

          · Post-surgery or illness recovery to prevent muscle loss

          · Anyone looking to support muscle health, recovery, or total-body protein needs

          Does this replace eating protein or using protein powders?

          No. Whole foods and whey protein remain important for overall nutrition. This formula is designed to efficiently activate muscle protein synthesis, especially when consuming large amounts of protein isn’t practical or convenient.

          Should I take Muscle Code if I already use a pre-workout?

          Yes. Pre-workouts provide energy and focus, while Muscle Code provides the building blocks for muscle repair. Use post-workout if you’re already taking a pre-workout.

          What does MuscCan it be mixed into water, smoothies, or coffee?le Code taste like?

          Yes. Muscle Code dissolves easily and can be added to water, shakes, or smoothies. Amino acids can take time to fully dissolve, but there will not be clumps.

          Are there any side effects?

          Muscle Code is well-tolerated. No common side effects have been reported.

          Can I take it with other supplements?

          Yes. It can be stacked with protein powders, creatine, or pre-workouts.

          Can I take Muscle Code if pregnant or breastfeeding?

          Consult your healthcare provider before use.

          Is it safe for children or teens?

          Muscle Code is designed for adults. Consult a pediatrician before use in minors.