I stopped reading here:

GABA, or gamma amino buytric acid, is depleted in both the manic and depressed states, as is serotonin. L-tryptophan is the main precursor to serotonin, so if you take tryptophan, along with B6, B12, C, calcium, magnesium, and zinc necessary for it to metabolize first into 5HTP and then into serotonin, you don’t need to take those potentially damaging drugs called serotonin reuptake inhibitors (SSRI’s).

Based upon that quote, this doesn't sound like a reputable source to me.

I think it's a good idea to talk to your mdoc before taking amino acids. There's a big difference between taking them and a multivitamin, and you are already taking a lot of supplements