Vitamin D3 / Cholecalciferol

Vitamin D refers a group of closely related compounds that exhibit antirachitic activity. It can be ingested as part of the diet or absorbed by exposing the body to sunlight. The two most prominent forms of vitamin D are ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3). Vitamin D3 is hydroxylated in the liver into 25-hydroxy-vitamin D (25-OHD3), the circulatory and stored form of the vitamin. 25-OHD3 is transported to the kidneys where it can be converted into the active hormonal form 1,25 dihydroxy-vitamin D 1,25-(OH)2D3 or calcitriol. The main products used in animal nutrition are vitamin D3 and 25-OHD3.

Main function

Regulation of calcium and phosphorus metabolism

Biological functions

  • Calcium and phosphorus absorption in the small intestine and mobilisation of calcium in the bones
  • Synthesis of calcium-binding components and regulation of the calcification of egg shells and bones
  • Regulation of immune cells

Benefits for the animal

  • Improved bone quality, growth, egg yield and quality of shell, meat quality (beef), health and well-being

Product specifications & properties

  • Content: 450,000-600,000 IU/g
  • Loss on drying: max. 5%
  • Appearance: beige to yellowish-brown granulate
  • Type of synthesis: chemical synthesis
  • Additional testing: additional testing in an external laboratory according to P 04 A 01
  • Storage: no special guidelines, store in a dry, cool and dark place away from moisture and heat
  • Stability: 2 years  
  • Packaging: 25 kg cardboard boxes

Regulatory status

Feed additive, category: vitamins and provitamins

Manufacturing and supply

WELDING supplies vitamin D3 500,000 IU/g (EU Code: E 3671) from qualified Chinese manufacturers.


Welding GmbH & Co. KG is not the manufacturer of the product. All product information and analytical data serves only as a product descrip