#medicine

Epidemiologist Katelyn Jetelina breaks down BPC-157, TB-500, and the peptide boom — what the science actually shows (mostly animal studies), the regulatory whiplash after RFK Jr.'s Rogan appearance, and why people skeptical of vaccines embrace compounds with even less human evidence.

The asymmetry framing is sharp — the same post hoc fallacy that drives vaccine skepticism ("got the shot, then got sick") gets applied in reverse for peptides ("injected it, tendon healed"), but without the control group skepticism. Worth noting: RFK Jr.'s Rogan announcement in February 2026 changed no FDA rules — as of publication, compounding peptides like BPC-157 remained legally restricted.