Who injects peptides and why?

60% men and 40% women, aged 35 to 60: gym-goers, ex-athletes, biohackers, longevity-clinic clients, for weight (40%), injury recovery (25%), anti-aging (20%) and performance (15%). Because the doctor says rest and the influencer says inject. No government counts them: they buy by phone or online, mix Chinese powder with sterile water in the kitchen, and inject themselves.