Increase Height Products

Patient: Hi Doc..I would like to use some of the “height increase” product such as (Growth Flex or Height gainer)Unlike my brothers who are in the range 5.8 to 5.10 ft, im only 5.4 ftThe URLs to the product’s sites are listed belowwww.heightsecrets.comwww.heightgainer.comSome Doctors on the internet say its ok to use these products, but I want to make sure they are safe before I go on and purchase them..I would so much appreciate your answer, I’m so concerned about this.