GHRP-6 and MK677 are by far the two strongest for appetite.. I would put 677 at the top slightly over ghrp-6... ghrp-2 is known to have an appetite boost but more fat burning qualities to it... it certainly can help boost appetite but would be inferior to the latter 2 options... One of the major differences between GHRP 2 and GHRP 6 is that the latter increases hunger in you substantially, especially when the subject of study consume the supplement at regular intervals. Therefore, those looking to build muscles and lose excess fat may want to consider GHRP 2 as it is not known to build appetite in subjects of study to that extent. However, if the study aim is to eat more and growth quickly than GHRP 6 is better.
For the best quality make sure to check out Umbrella Labs or RCS!