People are injecting DIY peptides for weight loss and longevity. Doctors are alarmed at the side effects.

At high-end longevity clinics around the globe, doctors say interest in injectable peptides is climbing, and so are injuries linked to them. Getty Images A man with a mysterious case of full-body hives in Abu Dhabi. A Californian rushed to the hospital with a life-threatening allergic reaction. A fit, gym-going man in Texas with soaring blood sugar — inexplicably headed for pre-diabetes. Doctors working on the bleeding edge of longevity care in high-end clinics around the globe — from concie...