Ha ha! That is definitely not in your control. I just laugh every time I see and ad on tv the advertises a growth spurt. It just will not happen. Your height is determined by your genes and if your parents are tall then there is a good chance that you will be tall as well. Growing we grow tall or not is definitely not in our control and you might as well give up hopes of any artificial stimulant. In other words nature decides your height and you have control over it. Sorry if burst your bubble but that is the truth.