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Supplementing with L-Tryptophan to get the benefits of increased growth hormone?

I have a few questions about supplementing with tryptophan for this benefit.
-how much and when should it be taken?
-how long should it be taken?
-are there any harmful effects associated with taking L-tryptophan in teenagers
-in the end is it worth it?

Ps: I am mainly looking for advice from a professional or someone who has done some research.
I forgot to add this.

-Where should I order it from?
-Pill or powder form?
-Any reputable manufactures or manufacturers to avoid?