Usage examples (28)

• In plants, the tryptophan is produced endogenously where in animals the tryptophan used comes from diet.
• To make matters more interesting, tryptophan is present in many protein-rich foods, which have been found to prevent serotonin production.
• Dairy foods contain tryptophan, which is a sleep-promoting substance.
• Turkey contains a natural chemical called tryptophan, which we need to build proteins for our bodies.