GHRP-6 is run at around 100mcg, 3x daily (morning, post-workout, and pre-bed) the technical data on it shows insignificant increase in GH release using doses above 100mcg, and I have found this to be spot-on, I've run a ton of the stuff.
Like the other guys said, you will get better bang for your buck if you run it with CJC-1295, or Mod GRF 1-29, also dosed at 100mcg, at the same time you do your GHRP-6 pins.
Places like Extreme Peptide, Southern Research, even have combos of the two, save some cash.
You will definitely notice skin tightening, maybe as early as a week into it, and a glowy-ness (not greasy or nasty, but youthful) to your complexion, overall you will feel better, healthier, more energized. And no, this is not a sales-letter.
And yeah, you will destroy your fridge on GHRP-6, while leaning-out at the same time. Weird.