just to throw this in the mix.
i've tried IGF three times. first two were mediocre gains and i was dosing it at 40mcg's both times for 25 days straight using the IM method. the third time, i experimented with the palumbo protocol which calls for low dosages (11-20mcg's) ED taken PWO sub-q (injection times are debatable though). anyhoo, the third experiment provided far superior gains than the first two so the low dose method is definately worth acknowledging. the basic theory behind it is when you take greater doses, your body stops responding to it, within a week or so. however, with lower doses, this doesn't happen and you are able to have consistent, yet remarkable, gains throughout the cycle.
note: first two times were premixed solution from a reputable company. third was a powder that i reconstituted myself before use. also, to repeat, i used IM the first two times, and sub-q the third time.
just sharing my observations.