insulin pin it the way to go, as for injecting the site being trained, this was a common belief shared on the internet several years back when igf first became rasily available on the market. now days, i hear that it turns out to be less important than once thought and i tend to agree. once you inject your water based peptide, blood flow begins to carry it away and circulate it through your body. i have taken to injecting bi's, tri's and delts, depending on availablility due to which site is available(not irratiated by recent aas injections) and honestly, after having run a number of mg's of igf in this fashion, i have seen no difference than yrs ago, when i had bilaterally injected the muscle group trained.