Overview
Milk Thistle (Silybum marianum) is a flowering herb native to Mediterranean regions, now cultivated globally for its medicinal seeds. Its active compounds, collectively called silymarin, are renowned for liver-protective properties. Historically used in traditional European and Asian medicine, it is now a key ingredient in modern hepatoprotective drugs and dietary supplements. In B2B markets, Milk Thistle is traded as dried seeds, standardized extracts (typically 70-80% silymarin), or purified silybin. The herb is valued in pharmaceutical, nutraceutical, and cosmetic industries, with demand driven by growing awareness of liver health and natural remedies.
Physical and Chemical Properties
The seeds of Milk Thistle contain 1.5-3% silymarin, a flavonolignan complex comprising silybin, isosilybin, silychristin, and silydianin. Silybin is the most biologically active component, with strong antioxidant and anti-inflammatory effects. The extract appears as a light yellow to brown powder, soluble in organic solvents but poorly soluble in water. Silymarin stabilizes liver cell membranes, scavenges free radicals, and promotes protein synthesis, which aids liver regeneration. Its stability depends on storage conditions—exposure to heat, light, or moisture degrades potency. Analytical methods like HPLC are used to quantify silymarin content for quality control.
Main Applications
Milk Thistle is primarily used to treat liver disorders, including cirrhosis, hepatitis, and fatty liver disease. Clinically, silymarin is administered to counteract toxin-induced liver damage (e.g., from alcohol or Amanita mushroom poisoning). It is also included in detox supplements and skincare products for its antioxidant benefits. In the food industry, Milk Thistle seeds are pressed for oil rich in unsaturated fatty acids. The herb’s byproducts are explored in animal feed to enhance livestock liver function. B2B buyers often seek standardized extracts for consistent dosing in capsules, tablets, or liquid formulations.
Safety and Storage
Milk Thistle is classified as Generally Recognized as Safe (GRAS) by the FDA, with rare side effects like mild diarrhea or allergic reactions. However, it may interact with certain medications (e.g., anticoagulants or antipsychotics), necessitating professional advice before use. For storage, bulk extracts should be kept in moisture-proof containers at temperatures below 25°C. Suppliers often provide certificates of analysis (CoA) detailing silymarin concentration, heavy metal levels, and microbial limits to ensure compliance with pharmacopoeial standards like USP or EP.
B2B Procurement Guide
When sourcing Milk Thistle, prioritize suppliers with ISO or GMP certification to guarantee quality. Key specifications include silymarin content (70-80% for premium extracts), solvent residues (e.g., ethanol), and pesticide/toxin testing. Organic-certified products command higher prices but cater to niche markets. Pricing varies by extraction method (e.g., supercritical CO2 vs. ethanol) and order volume. Long-term contracts with farms in Europe or China can stabilize supply. Buyers should audit suppliers for traceability, from seed cultivation to final extraction, ensuring ethical and sustainable practices.
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