“What’s your stack?” Once, that question may have referred to playing cards or a club sandwich. Then fashion people latched onto it to describe an armful of bracelets. Now it refers to peptide injections, which the longevity-obsessed employ in various combinations, or stacks, to boost their stem cells, growth hormones, immunity, mitochondria, gut microbiome, energy, stamina, muscle mass—in short, everything under the sun.
It’s all very cutting edge, very Peter Attia, pre–Epstein files. The problem is, many of these peptides aren’t approved by the F.D.A. They come from compounding labs, some reputable and some not. They rely on substances that might originate in China, from labs that might not be sterile. And I don’t need to tell you how risky it is to inject yourself with an unregulated, potentially impure substance.
