I know this thread is old, but I just wanted to add that DL-Phenylalanine and L-Phenylalanine make me very pro social. I have social anxiety so most of the times, I tend to avoid meeting people, having conversations, etc, but when I use DLPA, wow... I actually enjoy having conversations! I don't know if it's because of the endorphins, or because of the dopaminergic effect, but nothing helps me better than this.
I wish I could use it daily for the rest of my life, but I know this is not realistic. Tolerance and poop-out will definitely occur after weeks or months of daily use.