Does this supplement work at all for recovery?

I have heard most GABA supplements don’t cross the blood brain barrier…yet this one specific kind does that has L-theanine in it. Has anyone used this or can verify if it works or not? Thanks.
http://www.suntheanine.com/

Recently bought 100mg pills of L-Theanine, hasn’t done much for me.

Where do you find these 3 types of pills? Can you get them at any pharmacy or supplement store? I’ve looked for GABA pills and cannot find them. Are they called something else? How much should each of these three things be taken?
Does anyone else recommend taking anything else? I’m currently taking a multivitamin, omega3s and ginko biloba. Any advice is always appreciated since I still feel horrible after quitting 6 months go