^ BRO they have to say it's for external use so they can sell it. You can't sell shit you inject over the counter. It's word play....they mean you gotta inject it.
go to
professionalmuscle and look around. Big A who is an ifbb pro, goes into great detail on how to use it. He basically have everything outlined on how much and when you need to inject.
FYI: This is going to require DAILY injection into the same muscle. Most people can't handle it.
Take pictures bro of the bottle and post them up. I have never bought synthol so i'm not sure.