Vitamin D3[2]
Overview
Vitamin D3, or cholecalciferol, is a biologically active form of vitamin D critical for maintaining calcium homeostasis and bone mineralization. Unlike Vitamin D2 (ergocalciferol), it is derived from animal sources (e.g., fish liver oil, lanolin) and synthesized in human skin via UVB exposure. Industrially, it is produced through UV irradiation of 7-dehydrocholesterol extracted from wool grease. As a key nutrient, Vitamin D3 is widely used in supplements and fortified foods to address deficiencies, particularly in regions with limited sunlight. Its role extends to immune modulation and cellular health, driving demand in pharmaceutical and nutraceutical markets.
Physical and Chemical Properties
Vitamin D3 is a sterol derivative with a molecular structure resembling cholesterol. It appears as a white crystalline powder, insoluble in water but readily dissolves in lipids and organic solvents like ethanol or acetone. The compound degrades under prolonged exposure to light, heat, or oxidizing agents, necessitating opaque packaging and cold storage. Its melting point ranges between 83–86°C, and it exhibits moderate stability in neutral pH environments. Analytical methods like HPLC are employed to assay purity, which typically exceeds 97% for pharmaceutical-grade material.
Main Applications
The largest application of Vitamin D3 is in dietary supplements, often combined with calcium to support bone health. It is also added to fortified foods such as milk, cereals, and infant formula to prevent deficiencies. In pharmaceuticals, it treats conditions like rickets, osteoporosis, and hypoparathyroidism. Animal nutrition is another major sector, where Vitamin D3 enhances livestock growth and eggshell quality in poultry. Emerging research explores its potential in autoimmune disease management and cancer prevention, though these uses remain investigational.
Safety and Storage
Vitamin D3 is safe at recommended doses (400–4,000 IU/day for adults) but can cause hypercalcemia in excess. Occupational handling requires gloves and eye protection to avoid irritation. Bulk material should be stored in airtight containers at 2–8°C, with desiccants to prevent moisture absorption. Regulatory agencies (FDA, EFSA) mandate strict labeling for supplements, including daily value percentages. Stability testing is crucial for shelf-life determination, as degradation products like 5,6-trans-Vitamin D3 may form under improper storage.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with GMP certification and batch-specific Certificates of Analysis (CoA). Key parameters include purity (≥97%), residual solvents (e.g., <0.5% ethanol), and microbiological limits. Pricing varies by quantity (e.g., discounts for >100 kg) and formulation (oil-based vs. powder). For international shipments, ensure compliance with regional regulations (e.g., EU Novel Food status, US FDA GRAS). Partner with logistics providers experienced in temperature-controlled transport to maintain product integrity.
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