First time today

Tried out some phenibut for the first time earlier. Used one scoop which was about 450mg at 4:30pm. Haven't felt much different 5 hours later, although I haven't been expecting much as i know it's a small dose and i'm just testing the waters.

Gonna leave it a couple days and try again, not sure on the dosage next time. Can anyone suggest a dosage for me, im 26 and 210lbs and what's the best way to take it?