How long does it take to notice a difference when taking L-Tryptophan?

[Cicero]

So I'm getting this supplement in a week. And I was wondering how long does it take until it helps depression and insomnia? Have you done it? If so, how did you feel? Will I feel a big difference when taking it? How expensive is it? How many pills do I take a day?

[Wooba]

The supplement should start working that night. I've never used this, but i just read up on it a little bit for you.. a lot of people develop abdominal pain, bloating, nausea and loss of appetite. So watch out for that.
Also your doc should tell you how much / when to take it. If you're not getting it from a doctor, talk to a doctor first. He might choose something more suited for your needs.