Tryptophan is an amino acid needed for normal growth in infants and for the production and maintenance of the body's proteins, muscles, enzymes, and neurotransmitters. It is an essential amino acid.

Promois encapsulated L-Tryptophan is one of essential amino acids and the forth limiting amino acid in animals diets, which means it could not be synthesized by the body, in addition, dietary supply  through feed materials is usually insufficient. The deficiency of L-Tryptophan was generally characterized as decreased feed intake and efficiency, and slow growth rate. Considering L-Tryptophan playing a key role in growth performance and feed efficiency, it is recommended to add L-Tryptophan in diet to achieve the optimal amino acid balance and fulfill the digestible tryptophan requirement of animals, especially piglets, sows and poultry etc.

The body uses tryptophan to help make melatonin and serotonin. Melatonin helps regulate the sleep-wake cycle, and serotonin is thought to help regulate appetite, sleep, mood, and pain. The liver can also use tryptophan to produce niacin (vitamin B3), which is needed for energy metabolism and DNA production.

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Other Names : L-Tryptophan
Grade Standard : Food Grade, Medicine Grade
Usage : Animal Pharmaceuticals, Animal Pharmaceuticals
Product Name : L-Tryptophan Powder
Appearance : white fine powder
Shelf life : 2 Years Proper Storage
Sample : Available
Grade : Food Grade; Medicine Grade
Color : White
Packing : 25kgs/fiber Drum
Application : Health Supplement
Type : Vitamins, Amino Acids and Coenzymes
Storage : Cool Dry Place

  • Supplement L-Tryptophan in feed can offer following benefits for the industry, which have been proven by abundant trials and research.
  • Increase the feed intake.
  • Optimize the amino acid profile in feed, particularly essential amino acid profile
  • Reduce crude protein level in diets without impact on animal growth performance, particularly low protein diets for post-weaned piglets.
  • Improve the growth rate, weight gain and feed efficiency.
  • Enhance the overall growth, even under stress conditions for immune system, such as depressed, vaccination and deteriorated hygiene conditions.
  • Save the entire cost of feed.


  Appearance   White Crystal or Crystalline powder  
  Identification ( IR )   Concordant with the reference spectrum  
  Assay   99.0~100.5%
  Ph   5.4~6.4
  Specific rotation [a]D20     -30.5°~-32.5°
  Chloride ( CI )   0.02% max.
  Sulphate ( SO4 )   0.02% max.
  Iron ( Fe )   20ppm max.
  Heavy metals ( Pb )   10ppm max.
  Loss on drying   0.20% max.
  Residue on ignition   0.10% max.

PACKING SIZE : 25 kg bag
STORAGE : Store in cool and dry place
SHELF LIFE : 2 years from date of manufacturer with proper storage conditions.

USES : L-tryptophan is used for insomnia, sleep apnea, depression, anxiety, facial pain, a severe form of premenstrual syndrome called premenstrual dysphoric disorder (PMDD), smoking cessation, grinding teeth during sleep (bruxism), attention deficit-hyperactivity disorder (ADHD), Tourette's syndrome, and to improve performance.

Tryptophan is an essential amino acid that serves several important purposes, like nitrogen balance in adults and growth in infants. It also creates niacin, which is essential in creating the neurotransmitter serotonin. There are two types of tryptophan: L-tryptophan and D-tryptophan.

L Tryptophan is an important precusor substance of auxin biosynthesis in plant. It widely exists in higher plant. There are two ways to synthetic auxin. The first is tryptophan oxidizes and deaminize and form indole acetone,then decarboxylation and form IAAId; Under the corresponding enzymes IAAId oxsidizes indoleacetic acid. The second way is decarboxylation and form to tryptamine then tryptamine oxsidize deamination finally forms tryptophan.

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