Hello doctor. my friend.age22 & height 5.2inch but now he gonna take growth hormone products. or pills. what should he do???

Possibly not safe: In the first place a 22 year old is unlikely to get any taller with HGH. It would be very expensive. People who have not finished growing may gain height with HGH. There may be little downside if it is legitimate source. Overall I think the risk of false medication severely outweighs the benefits of human growth hormone in a young healthy man. Just don't do it unless from a doctor!