Overview
3-Hydroxy-3-methylbutyric acid (HMB) is a bioactive metabolite derived from the amino acid leucine, playing a critical role in protein metabolism. It is synthesized in small amounts in the human body and has gained prominence in the nutraceutical and pharmaceutical industries for its ability to reduce muscle breakdown and enhance recovery. HMB is classified as a β-hydroxy β-methylbutyrate and is commercially available in calcium salt (Ca-HMB) or free acid forms. Its applications span from dietary supplements for athletes to therapeutic uses in muscle-wasting conditions. Industrial production typically involves chemical synthesis or microbial fermentation.
Physical and Chemical Properties
HMB is a white, odorless crystalline powder with a molecular weight of 118.13 g/mol. It exhibits high solubility in polar solvents like water and ethanol, making it suitable for liquid formulations. The compound is stable under ambient conditions but may degrade under prolonged exposure to heat or humidity. Its melting point ranges between 80-82°C, and it lacks a defined boiling point due to decomposition at higher temperatures. The density is approximately 1.13 g/cm³. Analytical methods such as HPLC and NMR are commonly employed to verify its purity, which typically exceeds 98% for pharmaceutical-grade material.
Main Applications
HMB is extensively used in sports nutrition as an ergogenic aid to mitigate exercise-induced muscle damage and accelerate recovery. Clinical studies support its efficacy in reducing protein catabolism, particularly in elderly populations or patients with muscle atrophy. In animal husbandry, HMB is added to livestock feed to improve lean muscle mass and feed efficiency. The pharmaceutical industry explores its potential in treating cachexia and metabolic disorders. Emerging research also investigates its anti-inflammatory and neuroprotective properties.
Safety and Storage
HMB is generally considered safe for human consumption at doses up to 3 grams per day. Regulatory agencies like the FDA classify it as GRAS (Generally Recognized as Safe) for specific applications. However, excessive intake may cause mild gastrointestinal discomfort. Proper storage involves keeping the compound in airtight containers at room temperature, away from direct sunlight and moisture. Bulk quantities should be stored in climate-controlled warehouses to prevent clumping or degradation. Safety data sheets (SDS) recommend using personal protective equipment (PPE) during handling to avoid inhalation or skin contact.
B2B Procurement Guide
B2B buyers should prioritize suppliers with ISO or GMP certifications to ensure product consistency and traceability. Key procurement considerations include batch-specific Certificates of Analysis (CoA) detailing purity, heavy metal content, and residual solvents. Prices vary based on order volume and purity grade, with discounts often available for contracts exceeding 100 kg. Due to its hygroscopic nature, buyers should confirm packaging standards (e.g., aluminum-lined bags) for international shipments. Leading manufacturers are concentrated in China, North America, and Europe, with MOQs (Minimum Order Quantities) typically starting at 25 kg.
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