Why would the supplement "5-htp" cause me to be irritable and angry?

Question

Why would the supplement "5-htp" cause me to be irritable and angry?

Answer 1

different people have different bodies. anyway people say they will be able get to sleep better when taking 5-htp but i found it hard to sleep after i took it.

Answer 2

How much did you take?  What did you take it with?

It has exactly the opposite effect with me.

Answer 3

I don't know. How much of it did you take?