L-Leucine (CAS# 61-90-5), also known as (S)-2-amino-4-methylpentanoic acid, L-α-aminoisocaproic acid, or simply leucine, is an essential branched-chain amino acid (BCAA) with the molecular formula C₆H₁₃NO₂ and a molecular weight of 131.17 g/mol. Its molecular structure features a central α-amino acid core with a branched isobutyl side chain—a hydrophobic aliphatic moiety that confers unique physicochemical and biological properties. As a white to off-white crystalline powder with a melting point of approximately 293°C (decomposition), L-leucine is sparingly soluble in water (approximately 22 g/L at 20°C) but dissolves readily in dilute acids and alkaline solutions. The compound exhibits a specific optical rotation of +15.0° to +17.0° (c=2, 6M HCl) and meets stringent pharmacopoeial specifications including EP, JP, and USP standards.
L-Leucine is one of the nine essential amino acids that cannot be synthesized by the human body and must be obtained through diet. As the primary metabolic trigger for protein synthesis through activation of the mechanistic target of rapamycin (mTOR) pathway, L-leucine plays a uniquely critical role in muscle protein synthesis, metabolic regulation, and immune function. Its essentiality and multifunctionality have made it an indispensable ingredient in parenteral and enteral nutrition formulations, sports nutrition supplements, cell culture media, and pharmaceutical excipients. The global market for L-leucine was valued at approximately USD 1.20–1.26 billion in 2025 and is projected to grow to USD 1.85 billion by 2032 at a CAGR of 5.6%, with other estimates suggesting a market size of USD 279–300 million in 2025–2026 and USD 536 million by 2035 at a CAGR of 7.5%. This growth is driven by rising demand in clinical nutrition, sports nutrition, pharmaceutical formulations, and animal feed. Based on its chemical characteristics and industrial significance, this article systematically analyzes the key properties, core application areas, global market structure, regulatory landscape, and future outlook of this strategically important essential amino acid.
Core Application Fields and Demand
Market demand for L-leucine (CAS# 61-90-5) is concentrated in four primary sectors: clinical nutrition and parenteral/enteral feeding (approximately 30–35% of global consumption), sports nutrition and dietary supplements (approximately 25–30%), pharmaceutical formulations and excipients (approximately 20–25%), and animal feed and agricultural applications (approximately 10–15%). Its essentiality and unique metabolic signaling properties serve as the core drivers of sustained demand growth across all sectors.
In clinical nutrition and parenteral/enteral feeding, L-leucine is a critical component of amino acid infusions and comprehensive amino acid preparations used for patients unable to obtain adequate nutrition through oral intake. It is employed in total parenteral nutrition (TPN) formulations for hospitalized patients, post-surgical recovery, and management of severe malnutrition. The pharmaceutical-grade L-leucine required for intravenous infusions and cell culture media must meet the highest purity standards—typically 98.5–101.0%—and comply with USP, EP, and JP pharmacopoeial specifications. Leucine is also used in the diagnosis and treatment of children with idiopathic hyperglycemia and as a nutritional supplement to support growth and reduce blood sugar levels.
In sports nutrition and dietary supplements, L-leucine is the most potent of the three branched-chain amino acids (leucine, isoleucine, and valine) for stimulating muscle protein synthesis through mTOR pathway activation. It is widely incorporated into protein powders, ready-to-drink beverages, and tablet formulations aimed at athletes, bodybuilders, and health-conscious consumers seeking to enhance muscle recovery, reduce exercise-induced muscle damage, and support lean muscle mass maintenance. L-leucine is also used as a hypertrophic agent to monitor its effects on myotubes in research settings. In the food industry, it functions as a flavor enhancer and nutritional supplement in protein-rich foods and beverages, catering to growing consumer demand for functional and fortified food products.
In pharmaceutical formulations, L-leucine serves multiple roles beyond its nutritional function. It is used as a tablet lubricant and excipient in solid dosage forms, improving manufacturing efficiency and tablet quality. In drug formulation, L-leucine enhances the stability and solubility of certain medications, ensuring better bioavailability and efficacy. It is also incorporated into formulations for treating muscle-wasting diseases, supporting muscle protein synthesis in patients recovering from surgery or chronic illness. Leucine is an mTOR activator, making it a molecule of significant interest in metabolic and aging research. Additionally, L-leucine is used as a flavoring product in pharmaceutical preparations.
In animal feed and agricultural applications, L-leucine is added to livestock and poultry feed to optimize growth performance and feed efficiency. It is also used as a plant growth promoter in agricultural formulations.
In biotechnology and cell culture, high-purity L-leucine from non-animal sources is essential for mammalian cell culture media used in the production of biopharmaceuticals, vaccines, and recombinant proteins. Its role in peptide synthesis and small-molecule pharmaceutical development further expands its application scope.
Major Market Participants
The global supply system for L-leucine (CAS# 61-90-5) features a pattern of “specialized amino acid manufacturers, multinational pharmaceutical ingredient suppliers, and Chinese producers dominating large-scale production.” The market is characterized by high barriers to entry due to the technical complexity of pharmaceutical-grade amino acid production and stringent regulatory requirements.
In the global high-purity and pharmaceutical-grade segment, key international players include Ajinomoto (Japan), Evonik (Germany), and Kyowa Hakko Bio (Japan), which supply pharmaceutical-grade and food-grade L-leucine meeting USP, EP, and JP standards. Other notable suppliers include Sigma-Aldrich (Merck), which offers L-leucine from non-animal sources meeting EP, JP, and USP testing specifications, suitable for cell culture and peptide synthesis applications.
In the industrial and large-scale production segment, Chinese manufacturers have emerged as a dominant force in global supply. Major Chinese producers include Wuxi Jinghai Amino Acid Co., Ltd. (Aminowill), which is one of the largest amino acid manufacturers in China, producing large-scale pharmaceutical-grade and food-grade L-leucine along with other amino acids. Other significant Chinese manufacturers include Shijiazhuang Jirong Pharmaceutical Co., Ltd., a GMP-certified manufacturer of amino acids including L-leucine in both pharmaceutical and high-end food grades, and Hebei Changhao Biotechnology Co., Ltd..
China’s competitive advantages in L-leucine production include integrated supply chains, cost-efficient fermentation and extraction technologies, and extensive production capacities that serve both domestic and international markets. Chinese manufacturers supply L-leucine in various specifications including CP, EP, AJI, USP, FCC, and high-purity enterprise standards.
European and North American suppliers focus on high-purity and GMP-compliant grades for pharmaceutical and cell culture applications, while Chinese producers dominate the broader industrial, food, and feed supplement markets with competitive pricing and large-scale capacity.
Regional Market Dynamics
The global L-leucine market exhibits distinct regional characteristics, with production concentrated in Asia-Pacific (particularly China) and consumption distributed across North America, Europe, Asia-Pacific, and emerging markets. According to industry estimates, the global L-leucine market was valued at approximately USD 1.20–1.26 billion in 2025 and is projected to reach USD 1.85 billion by 2032 at a CAGR of 5.6%. Other projections indicate a market reaching USD 2.1 billion by 2026 and USD 3.6 billion by 2035 at a CAGR of 6.9%, while additional estimates suggest a market size of USD 279–300 million in 2025–2026 growing to USD 536 million by 2035 at a CAGR of 7.5%. The global market valuation for 2026 is projected to range from USD 280 million to USD 550 million, with a CAGR of 5.5–8.5% through 2031.
The Asia-Pacific region is the dominant force in the global L-leucine market, accounting for the largest share of both production and consumption. China serves as the world’s manufacturing hub, with extensive production capacities and integrated supply chains spanning fermentation, extraction, and purification. The rapid growth of the pharmaceutical, nutraceutical, and animal feed industries in China, India, and Southeast Asia continues to drive regional consumption. China is the world’s largest producer and exporter of L-leucine, supplying both domestic and international markets with competitive pricing and reliable quality.
North America remains a key market for high-purity and pharmaceutical-grade L-leucine, driven by demand from the pharmaceutical, biotechnology, and sports nutrition industries. The United States hosts major pharmaceutical companies, contract manufacturing organizations, and research institutions that require high-quality amino acids for drug development, cell culture, and clinical nutrition applications. The region’s well-established regulatory framework and emphasis on product quality support demand for USP/EP/FCC-compliant L-leucine.
Europe is characterized by stringent regulatory requirements and a strong focus on quality and sustainability in pharmaceutical and food applications. The region’s pharmaceutical industry demands GMP-compliant amino acids with full documentation, while the growing sports nutrition and functional food sectors drive demand for high-purity L-leucine. European consumption relies substantially on imports from Asia-Pacific for this essential amino acid.
Latin America and other regions represent growing markets, with demand driven by expanding pharmaceutical manufacturing, agricultural development, and increasing consumer awareness of sports nutrition and dietary supplements.
Regulatory and Safety Considerations
As an essential amino acid used in pharmaceuticals, food products, dietary supplements, and animal feed, L-leucine (CAS# 61-90-5) is subject to regulatory oversight in major global economies. Compliance with relevant regulations is essential for market access and trade.
In the United States, L-leucine is listed in the FDA’s EAFUS (Everything Added to Food) database as a food additive and is recognized as Generally Recognized as Safe (GRAS) for its intended uses. The FDA issued no objections for GRAS notices on L-leucine in 2010 and 2014, and further GRAS determinations have been made for instantized L-leucine. L-leucine is permitted as a food additive under 21 CFR 172.320 and 172.804 and carries FEMA No. 3297. The FDA has also reviewed and had no questions regarding GRAS determinations for L-leucine submitted by major manufacturers.
In the European Union, L-leucine is an approved flavoring substance (No. 17.012) and is permitted for addition in dietetic foods. The European Food Safety Authority (EFSA) has evaluated L-leucine and found it safe for intended uses. The compound is listed in the European Pharmacopoeia (EP) and meets EU regulatory standards.
L-Leucine is recognized as a permitted food ingredient by the U.S. FDA, the European Food Safety Authority, and equivalent regulators worldwide. It is listed in the British Pharmacopoeia (BP), United States Pharmacopoeia (USP), European Pharmacopoeia (EP), and Japanese Pharmacopoeia (JP). The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has determined that L-leucine presents no safety concern at current levels of intake when used as a flavoring agent. L-leucine also carries Halal and Kosher certifications from many suppliers.
GHS classification and handling: L-Leucine is generally recognized as safe and is not classified as a hazardous substance under standard GHS criteria. Standard industrial hygiene practices should be followed during handling, including the use of appropriate personal protective equipment when handling large quantities. The compound should be stored in a cool, dry place in tightly closed containers, protected from moisture and light.
For international transport, L-leucine is not classified as hazardous material for DOT/IATA transport purposes. Proper packaging, labeling, and documentation are nevertheless required for international shipping in compliance with the International Maritime Dangerous Goods Code (IMDG Code) and other transport regulations. The compound is typically shipped in fiber drums or multi-layer bags of 25 kg net weight.
Future Outlook
The market outlook for L-leucine is highly positive, supported by several key growth drivers across its major application segments. The global market is expected to maintain strong growth through the coming decade, with projected CAGRs ranging from 5.5% to 8.5% and some estimates suggesting growth at 7.3%.
Key growth drivers include:
- Expanding clinical nutrition market: The growing global demand for parenteral and enteral nutrition products, driven by aging populations, increasing hospitalization rates, and rising prevalence of chronic diseases, sustains demand for pharmaceutical-grade L-leucine.
- Growth in sports nutrition and dietary supplements: The rapidly expanding global sports nutrition market—driven by increasing health consciousness, fitness participation, and consumer demand for protein-based supplements—supports strong demand for L-leucine as the key muscle-protein synthesis trigger.
- Rising demand for functional foods and beverages: Consumer preference for fortified and protein-enriched food products drives demand for L-leucine as a nutritional supplement and flavor enhancer.
- Expansion of biopharmaceutical manufacturing: The growing production of biopharmaceuticals, vaccines, and cell-based therapies increases demand for high-purity L-leucine for cell culture media applications.
- Increasing pharmaceutical applications: The compound’s roles in formulations for muscle-wasting diseases, metabolic disorders, and as a tablet excipient continue to expand.
- Growth in animal feed and aquaculture: Rising global demand for animal protein drives consumption of L-leucine in livestock and poultry feed formulations.
Challenges and considerations:
- Raw material price volatility: Fluctuations in the prices of fermentation substrates and energy inputs may impact production costs.
- Regulatory compliance: Increasingly stringent pharmaceutical and food safety regulations may require ongoing investment in quality systems and documentation.
- Competition from synthetic alternatives: The market faces competition from synthetic amino acids and alternative protein sources.
- Supply chain concentration: The heavy concentration of production in China creates potential supply chain vulnerabilities that may concern international buyers seeking diversification.
To succeed in this evolving market landscape, suppliers must focus on product quality (particularly for pharmaceutical-grade applications requiring USP/EP/JP compliance and high enantiomeric purity), supply chain reliability, regulatory compliance, and the development of sustainable production methods. Companies that can offer high-purity products, flexible packaging options, and responsive technical support will be well-positioned to capture growing demand.
Shanghai XinChem Co., Ltd. (XinChem)
As a world-leading supplier of organic chemicals and pharmaceutical intermediates, Shanghai XinChem Co., Ltd. (XinChem) is dedicated to meeting the innovative needs of the pharmaceutical, nutritional, biotechnology, and fine chemical industries. Leveraging extensive experience and advanced manufacturing capabilities, XinChem provides high-quality L-Leucine (CAS# 61-90-5) to customers worldwide. As a trusted manufacturer and supplier based in China, XinChem combines competitive pricing, reliable supply, and exceptional service to establish itself as a preferred partner for businesses and research institutions seeking this essential amino acid.
1. Technical Advantages
Advanced Fermentation and Purification Processes
XinChem utilizes state-of-the-art manufacturing facilities and rigorous quality control measures to ensure the purity, consistency, and safety of its L-leucine products. The production process incorporates advanced fermentation technologies and multi-stage purification, enabling the delivery of products meeting the highest pharmaceutical standards. Strict process control ensures consistent enantiomeric purity (L-configuration), minimal impurities, and batch-to-batch reproducibility, providing customers with reliable performance in pharmaceutical formulations, cell culture media, and nutritional applications.
Full-Chain Quality Control
The production process strictly adheres to international quality standards, with comprehensive quality control covering raw material sourcing, in-process monitoring, and finished product testing. Each batch is accompanied by a detailed Certificate of Analysis (COA) documenting physical and chemical properties, purity data, optical rotation, and impurity profiles. This commitment to quality ensures that XinChem’s L-leucine meets the stringent requirements of pharmaceutical, nutritional, and biotechnological applications, complying with USP, EP, JP, and FCC standards.
2. Product Advantages
High Purity and Consistent Quality
XinChem offers L-leucine in multiple purity grades: Pharmaceutical Grade meeting USP/EP/JP specifications (98.5–101.0%) and Food Grade meeting FCC standards. The product’s high purity and consistent quality minimize the risk of impurities and variability, making it suitable for demanding applications in parenteral nutrition, cell culture, and pharmaceutical formulations.
Comprehensive Specifications
Key specifications include:
- Molecular Formula: C₆H₁₃NO₂
- Molecular Weight: 131.17 g/mol
- CAS Number: 61-90-5
- EINECS Number: 200-522-0
- Melting Point: ~293°C (decomposition)
- Specific Optical Rotation: +15.0° to +17.0° (c=2, 6M HCl)
- Appearance: White to off-white crystalline powder
- Assay: 98.5–101.0% (dried basis)
- Solubility: Sparingly soluble in water; soluble in dilute acids and alkaline solutions
- Standards: USP, EP, JP, FCC
Flexible Packaging Solutions
XinChem provides a range of packaging options to accommodate diverse customer needs, from laboratory-scale quantities to industrial-scale fiber drums (25 kg net) and bulk shipments. Customized packaging solutions are available upon request, ensuring safe handling, storage, and transportation. Recommended storage conditions include storage in a cool, dry place in tightly closed containers, protected from moisture and light.
3. Application Fields
As an essential branched-chain amino acid, L-Leucine (CAS# 61-90-5) exhibits wide application value across multiple industries:
Clinical Nutrition and Pharmaceuticals:
- Essential component of parenteral and enteral nutrition formulations
- Amino acid infusions and comprehensive amino acid preparations
- Nutritional support for patients recovering from surgery or illness
- Diagnosis and treatment of metabolic disorders
- Tablet lubricant and excipient in pharmaceutical manufacturing
- Solubility and stability enhancer in drug formulations
Sports Nutrition and Dietary Supplements:
- Key muscle protein synthesis trigger via mTOR pathway activation
- Ingredient in protein powders, ready-to-drink beverages, and supplement tablets
- Support for muscle recovery and lean mass maintenance
Food Industry:
- Flavor enhancer and nutritional supplement in protein-rich foods
- Fortification of functional foods and beverages
Biotechnology and Cell Culture:
- Essential amino acid for mammalian cell culture media
- Component in biopharmaceutical and vaccine production
- Reagent for peptide synthesis and pharmaceutical research
Animal Feed and Agriculture:
- Nutritional supplement in livestock and poultry feed
- Plant growth promoter in agricultural formulations
4. Service Support
Technical Expertise and Customized Solutions
XinChem’s team of experienced chemists and pharmaceutical scientists provides full technical support throughout the customer journey—from product selection and specification development to application guidance and troubleshooting. Whether customers require optimization of formulation parameters, guidance on handling and storage, or assistance with regulatory documentation, XinChem’s technical experts are ready to help.
Global Logistics and Reliable Supply
With established supply chains serving markets across Europe, North America, Asia-Pacific, and beyond, XinChem ensures timely delivery and consistent product availability. The company’s logistics team manages all aspects of international shipping, including customs clearance and documentation, with the compound classified as non-hazardous material for transport.
Regulatory Support
XinChem provides comprehensive documentation to support regulatory compliance, including Safety Data Sheets (SDS), Certificates of Analysis (COA), and other required certificates. The company stays current with evolving regulatory requirements in major markets, including FDA GRAS, EFSA, REACH, and pharmacopoeial standards (USP, EP, JP), helping customers navigate the complexities of global trade.
5. Reasons to Choose XinChem
- Professionalism: Extensive experience and deep expertise in amino acid manufacturing and supply.
- Quality: Rigorous quality control, consistent enantiomeric purity, and adherence to USP/EP/JP/FCC standards.
- Reliability: Stable supply, competitive pricing, and timely delivery.
- Flexibility: Customized solutions to meet diverse customer needs, including custom synthesis and packaging.
- Service: Responsive technical support and comprehensive documentation.
Contact us today to start your partnership with XinChem!
Website: www.xinchem.com
Email: sales1@xinchem.com
WhatsApp: +86 18049800532
Post time: Aug-26-2026