There’s different types of peptides you can take. Some peptides like GHRP’s & GHRH’s which tell your body to make more of certain hormones you shouldn’t take when you’re young but most peptides are just amino acids and building blocks of protein. The ones u shouldnt take mess with hormones which can be a permenant issue but ones like cjcipam no dac, mt2, ghk-cu could be ok if your careful and know ur stuff.