Overview
Comfrey Extract is derived from the leaves and roots of Symphytum officinale, a perennial herb native to Europe and Asia. Historically dubbed 'knitbone,' it has been used for centuries in folk medicine for its remarkable tissue-regenerative properties. Modern extraction methods yield concentrated forms for industrial use. The extract’s therapeutic effects are attributed to compounds like allantoin (promotes cell proliferation) and rosmarinic acid (anti-inflammatory). Its applications span pharmaceuticals, dermatological products, and herbal supplements, though regulatory restrictions exist due to potential toxicity concerns.
Physical and Chemical Properties
Comfrey Extract typically presents as a viscous liquid or fine powder, with color varying from dark brown to green depending on the plant part and extraction solvent. Its water solubility makes it versatile for formulations, while its stability is pH-dependent (optimal at 5-7). Key markers include allantoin content (usually 0.5-5%) and minimal pyrrolizidine alkaloids (PA). Chromatography assays are essential for quality control. The extract may exhibit a characteristic earthy odor and slightly bitter taste, influenced by residual solvents like ethanol or glycerin.
Main Applications
In pharmaceuticals, Comfrey Extract is formulated into ointments for sprains, bruises, and arthritis due to its analgesic and anti-inflammatory effects. The cosmetic industry incorporates it into creams for eczema, psoriasis, and anti-aging products. Veterinary applications include hoof salves and wound gels. Recent research explores its potential in biodegradable adhesives and tissue engineering scaffolds. However, oral applications are banned in many regions; topical use dominates compliant markets.
Safety and Storage
Pyrrolizidine alkaloids (PAs) in raw comfrey pose liver toxicity risks. Industrial-grade extracts must undergo PA removal (<1 ppm recommended). Always wear gloves when handling concentrated forms; avoid inhalation of powder. Store in amber glass or food-grade HDPE containers at 15-25°C. Shelf life is typically 2-3 years with proper sealing. Regulatory compliance (e.g., EU Cosmetic Regulation No 1223/2009) mandates PA-free certification for cosmetic use.
B2B Procurement Guide
Prioritize suppliers providing third-party lab certificates for PA content, allantoin percentage, and microbial limits. Bulk buyers should negotiate MOQs (commonly 25-100 kg) for better pricing. Liquid extracts (30-50% dry matter) are cost-efficient for large-scale cosmetic producers. Consider organic-certified options for premium markets. Sample testing should include stability checks (e.g., precipitation at low temperatures). Incoterms like CIP or DDP are preferable for international shipments to ensure quality upon arrival.
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