niacinamide (the amide form is post chemical reaction).
https://en.wikipedia.org/wiki/Niacin#Adverse_effectshttps://en.wikipedia.org/wiki/Tryptophan#/media/File:Tryptop...
Tryptophan -> 5HTP -> Serotonin
Tryptophan -> Nicotinic acid -> Niacinamide
One thing they dont mention about nicotinic acid is it will soften your bones possibly because prostaglandins uses calcium inside the cell to rebind DNA. So then it becomes a case of take some K2-mk4 to help repair your bones, and thats when people are forced to explore the chemical pathways inside their bodies to compensate for other effects which perhaps they dont want.