FAT ASS!Look it can be done sub. BUT IM is best for getting it in to do its job ASAP.
You dont use a reg syringe b/c you are measuring too small of an amount. The slin needle is long enough to go IM unless you are some kind of fat ass, in such case you shouldnt be using igf-1 in the first place.
Ha that cracked me up man. But Kacunga is correct. It is best and most effective when pinned IM due to having a fasting response time, it is fine to pin SubQ but it will take a bit longer to repsond.