Essential amino acid L-Leucine for muscle muscle growth and repair


Other Name: L-Leucine
Spec./ Purity: 99% ( Other specifications can be customized)
CAS Number: 61-90-5
Appearance: White crystals or crystalline powder
Main function: muscle growth and repair
Test Method: HPLC
Free Sample Available
Offer Swift Pickup/Delivery Service

Product Detail

Packaging & Transportation




Product Description

L-leucine is one of the essential amino acids and plays an important role in protein synthesis, muscle growth and repair, so it has become one of the most popular dietary supplements and is included in BCAA and exercise supplements. It is involved in maintaining nitrogen balance, promoting tissue growth and maintaining normal physiological functions. In addition, L-leucine also plays a role in regulating blood sugar levels and insulin secretion.

SRS Nutrition Express offers year round, reliable product availability. We carefully select the highest quality and ensure you can make purchases with confidence through our supplier manufacturing process audit system. *Our products are not adulterated nor are they under the name of the World Anti-Doping Agency (WADA 2023).

Acetyl L-Carnitine

Technical Data Sheet

Items Specification Test Method

Physical&Chemical Data


White crystals or crystalline powder





Identification (Infrared


Corresponding to Reference Spectrum





Specific Rotation



Residue on Ignition



Loss on Drying



Chloride (Cl)






Sulfate ( SO4)



Heavy Metals

Heavy Metals






Arsenic (As)










Total Plate Count



Yeast & Mold



E. Coli

Negative in 10g



Negative in 10g


Staphylococcus aureus

Negative in 10g


Packaging &Storage

25 kg in Paper Drum

Stored In Cool and Dry place

Shelf Life

Two years

Function and Effects

★ Protein Synthesis Stimulation:

L-Leucine plays a crucial role in activating the mammalian target of rapamycin (mTOR) pathway, a key regulator of protein synthesis. This stimulation enhances the translation initiation process, leading to increased protein synthesis. Consequently, L-Leucine is essential for muscle protein synthesis and maintenance.

★ Muscle Growth and Repair:

As a branched-chain amino acid (BCAA), L-Leucine is particularly important for promoting muscle growth and repair. It contributes to the formation of muscle tissue and helps in reducing muscle protein breakdown, making it a vital component for athletes, bodybuilders, and individuals undergoing physical rehabilitation.

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★ Regulation of Blood Sugar Levels:

L-Leucine plays a role in modulating glucose metabolism by promoting insulin secretion and improving insulin sensitivity. This amino acid assists in the regulation of blood sugar levels, making it beneficial for individuals with insulin resistance or those seeking to manage diabetes.

★ Energy Production and Nitrogen Balance:

L-Leucine serves as a significant source of energy, particularly during periods of increased physical activity or stress. Additionally, it contributes to maintaining a positive nitrogen balance in the body, which is crucial for overall protein homeostasis and optimal physiological function.

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★ Cognitive Function and Neurotransmitter Synthesis:

L-Leucine is involved in the synthesis of neurotransmitters in the brain, such as glutamate and gamma-aminobutyric acid (GABA). This involvement suggests potential benefits for cognitive function, memory, and overall neurological health.

Application Fields

★ Sports Nutrition and Bodybuilding Supplements:

L-Leucine is a staple ingredient in sports nutrition supplements, particularly in formulations designed to support muscle growth, recovery, and performance. Athletes and bodybuilders often incorporate L-Leucine supplements into their training regimens.

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★ Diabetes Management:

Due to its role in insulin secretion and glucose metabolism, L-Leucine finds applications in diabetes management. It may be included in dietary interventions aimed at improving insulin sensitivity and blood sugar control.

★ Neurological and Cognitive Health Products:

With its involvement in neurotransmitter synthesis and potential cognitive benefits, L-Leucine is explored in the development of products targeting neurological health and cognitive function.

★ Animal Nutrition and Livestock Production:

L-Leucine is utilized in animal feed formulations to enhance growth and muscle development in livestock. Its inclusion in feed can contribute to improved protein utilization and overall animal health in agricultural practices.

Flow Cart

low chart of L-Leucine


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  • Packaging

    1kg -5kg

    ★ 1kg/aluminium foil bag, with two plastic bags inside.

    ☆ Gross Weight | 1 .5kg

    ☆ Size | ID 18cmxH27cm


    25kg -1000kg

    ★ 25kg/fiber drum, with two plastic bags inside.

    ☆ Gross Weight | 28kg

    ☆ Size| ID42cmxH52cm

    ☆ Volume| 0.0625m3/Drum.


    Large-Scale Warehousing



    We offer swift pickup/delivery service, with orders being dispatched on the same or next day for prompt availability. packing-3

    Our L-Leucine has obtained certification in compliance with the following standards, demonstrating its quality and safety:

    ★ GMP Certification (Good Manufacturing Practice)
    ★ ISO 9001 Quality Management System Certification
     ISO 22000 Food Safety Management System Certification
    ★ Kosher Certification
    ★ Halal Certification
     Halal Certification

    Q: What are the consequences of low leucine?

    A: 1. Protein synthesis is blocked

    Leucine is an important component of protein synthesis, and if leucine is low, it may affect protein synthesis in the body, leading to loss of muscle tissue and impaired function.

    2. Decreased immune function

    Leucine is essential for the proper functioning of the immune system. Low levels of leucine may lead to weakened immune function and an increased risk of infection.

    3. Insufficient energy supply

    Leucine can be converted into energy in the body for the body to use. Low levels of leucine can lead to a lack of energy supply, affecting the body’s normal metabolism and function.

    4. Cause fatigue and headache

    When dietary leucine intake is insufficient, it can also cause a range of symptoms, such as fatigue and headaches. In some cases, it can also cause dizziness and irritability.

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