Firstly, to clarify this peptide, GHRP-6 is a peptide a Growth Hormone Releasing hexapeptide, it's a 28 amino acid peptide, and it works by signaling to the pituitary gland to begin secreting Growth Hormone.
GHRP-6 lacks opioid activity, but you get a huge pulse, (dose dependent) in your own GH levels, and you get the effects of the increased IGF-1 secreted by the liver. Now both the increased GH and IGF-1 are highly desirable for athletes, bodybuilders and those looking to improve their own physique.
Now, you may have heard many bodybuilders saying that when you take GHRP-6 that they get a huge and very intense increase in appetite, about 20 mins after the initial injection. Well, this is caused by the GHRP-6 antagonising the peptide Ghrelin, it mimics it, but, in reality, it actually fights against it causing the signal for gastric emptying and hunger. Ghrelin is what many believes causes obesity, and insulin resistance amongst other things, and I believe this is one way by which GHRP-6 may help reduce fat, by fighting against it. However, there is always a but, if you take more than 150mcg the effects of the gastric emptying can be so strong that you may have the urge to severely stuff yourself with food, so if you're on a bulking cycle this is a great side effect, and, considering the price, it's a very cost-effective one. Therefore, during a bulking run, I rate this as the number one aid in increasing appetite, as you also get very a good anabolic effect and increased strength.
In one study, it was shown that GHRP-6 has a protective effect on the liver that seems to be mediated by IGF-I, TNF-alpha, and nitric oxide. Data also suggest that the anti-inflammatory effect of GHRP-6 in the liver is exerted on nonparenchymal cells, so, again, for pct this may prove an invaluable asset.
As for peptides, in general, they are fairly new as compared to other anabolics, but they are far better, and have way more potential during cycles and PCT, just how much remains to be seen.
Just remember not to eat carbs or fats 50 mins before and after a dose of GHRP-6 so as not to interfere with the GH pulse it will cause. In addition, 250mcg 3 times a day is the best dose I found to avoid overly mimicking ghrelin and still cause a large amount of muscle gain, tissue repair and fat loss.
As a peptide GHRP-6 is one of the easiest and most affective to use. A daily dose of just 300mcg split up into 3 doses will see a marked improvement in skin tone within 3 weeks; in addition, as an Anti-aging peptide GHRP-6 tops my list of all the injectable GHRP-s.