Amino Acids



L-tryptophan is the fourth limiting amino acid for piglets and the third limiting amino acid for fattening pigs. 

Product specifications & properties

  • Tryptophan content: min. 98%  
  • Loss on drying: max. 1%  
  • Appearance: white or light brown powder
  • Type of synthesis: fermentation
  • Additional testing: lead, cadmium, mercury and arsenic performed in an external laboratory
  • Storage: no special guidelines, store in dry conditions in sealed or closed containers and protect from light and heat
  • Stability: 2 years
  • Packaging: 10 or 20 kg bags

Regulatory status

Feed additive, category: amino acids, their salts and analogues

Manufacturing and supply

WELDING is one of the largest importers of Chinese L-tryptophan (EU Code: 3c440) in Europe and a major exporter to the overseas markets.


Welding GmbH & Co. KG is not the manufacturer of the product. All product information and analytical data serves only as a product description and has been provided to us by the manufacturer. It may not be interpreted as a guarantee of special properties or a guarantee of suitability for specific purposes. The customer is required to examine the suitability of the product for the intended purpose himself/herself before use.