In case anyone get the idea from reading the article that tryptophan and serotonin are good for you, check out Ray Peat and he has extensive writings on them.

My observation is that there are two type of brains when it comes to processing serotonin. One type processes it quickly and increased serotonin increases good feelings. The other type processes it very slowly and increased serotonin creates all kinds of problems for this type. This type also tends to struggle with slow processing of catecholamines.

According to Ray Peat, serotonin has many other functions in the body and increased serotonin can cause problems. Here is a good read: https://raypeat.com/articles/articles/serotonin-depression-a...