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acetyl CoA Figure 9 Metabolism of tryptophan and a large dose of tryptophan is administered, much of the tryptophan will be metabolized by an alternative pathway to kynurenic and xanthurenic acids, which will be excreted in the urine. This is the basis of the tryptophan load test for vitamin B6 status.

A small amount of tryptophan undergoes hydro-xylation to 5-hydroxytryptophan, which is then decarboxylated to the physiologically active amine 5-hydroxytryptamine (serotonin).

Alanine Alanine is metabolized by transamination to pyruvate.

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