Yet doctors warn that growth hormones are illegal without a licence – those found supplying them can face 14 years in prison and an unlimited fine. Even more worryingly, users of the hormone could be dicing with death. Nearly all of the Kigtropin entering this country is smuggled in or bought online with no control or guidance on how to take it. Mick Hart, author of the Layman's Guide to Steroids, says: "The danger is 99% will use it irresponsibly – taking way too much or not knowing how to inject it. Dealers want you to take as much as they can sell you. Cycles of hormone use used to be around eight weeks long and then some time off – now people are taking them solidly for two to three years."