IMO start small with the phenibut, like 250mg, then go from there, too high too quick is wicked sides yuck!. if you use 3-4 days then off for 2-3 it helps ease the built up tolerance. Can also try GABA 2-3 grams with low dosage of phenibut, 250-500mg, stacking the two can be good for some and help to use less of the phen cuz GABA is much cheaper.
Me personally I get a good relaxation sedating effect from 200-300mcg of ghrp2 or hex LOL Sure, I dose before bed and PWO, but if its my day off and I want to chill out and be mellow for a few hours then I'll take an extra dose mainly just for that effect but hey to each their own right LOL
oh I forgot, not a pep but herb, valarian root. claimed to be "herbal valium". I loved to party with the Roche 10mg V's back in the day so I can say if you dose enough it can have similar effects, sedating/relaxing/take edge off, etc. you can find a cheap brand at like walmart or target. the caps taste like shit cuz the herb is quite pugnant but gut a few and see how they work for ya.. too much tho can give you an unpleasant headache hangover effect tho so proceed with caution