I've used it with success for over a year now.
I believe that the powder form is best, pills don't seem to have the effect of the powder.
I mix it before bed with 4g of glutamine which also helps with recovery.
Empty stomach.
For a while I had a hard time fitting in the Muscle Milk before bed and taking GABA on an emtpy stomach.
I don't take Muscle Milk before bed anymore.
The best benefits I have noticed Sudo are the improved sleep and mental freshness when I wake.
Give it a try.
5g powdered GABA...I use Dymatize cause it's cheaper than VST.
4g glutamine
And yes I still use apple juice, just a little though, not even a cup, more like a shot.
Good day Sudo