Businessweek
The Anti-Aging Injection of the Moment: Do NAD and Peptides Work?
Peptides go beyond just GLP-1s and weight loss, promising everything from better skin to stronger workouts. Here’s what you need to know
Illustration by Sean Dong
Like many men his age, William Stern was tired. At 45, the husband, father of three, and founder of Cardiff, a small-business lender, said he felt grateful but “run down” by his very full life.
Meanwhile, on social media, he’d started seeing posts from influencers extolling a panacea for this sort of midlife malaise—injectable peptides. Stern texted a doctor friend and got one prescribed: tesamorelin, a weekly self-administered injection that prompts the release of growth hormone.