Is there any successful case of a person who's not deficient in growth hormone but still had gh injection?

Successful?: What do you mean by successful? What is your concern about your growth or physical health? GH is not indicated unless one has a proven deficiency.

Depends ? success?: Look at Sylvester Stallone, who I believe was busted for carrying GH vials during one of his flights. Some older men use this to help them fight the effects of aging, but you don't grow taller. Again, Stallone is relatively short, but is rumored to use GH to prepare for his buffed look.