Want to speed up your recovery after an injury or a workout? Some influencers are fans of shots of BPC-157 and TB-500 for that. Want scar-free, youthful skin and thick hair? Reddit posts rave about GHK-Cu and KPV. Want to build beautiful, bulky biceps? Some fitness influencers swear shots of ipamorelin will do wonders. This is the world of peptides — an assortment of chemicals that promise to boost your body and health — and people are self-injecting them in a growing wellness trend.Promoted by bodybuilders and influencers, supporters of the "Make America Healthy Again" movement and Silicon Valley early…