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L-TRYPTOPHAN Overview Information. L-tryptophan is an amino acid, a protein building block that can be found in many plant and animal proteins. L-tryptophan is called an âessentialâ amino acid because the body canât make it. It must be acquired from food.
The metabolism of tryptophan is an interesting example of biological control of amino acids. Tryptophan in the gut can be converted by bacteria to indoxyl, which is then absorbed into the blood and sulfated by the liver to produce indoxyl sulfate in the urine, sometimes called indican.This is a substance related to amino acid malabsorption or intestinal toxicity reactions.ryptophan is an essential amino acid. This means that it must be obtained through the diet in adequate quantities to meet the body's needs. Tryptophan is a precursor in the central nervous system of the neurotransmitter serotonin.