That doctor was selling a supplement. Supplement sales are largely scams, even the ones that are "developed by doctors". Also, its name is almost certainly des

That doctor was selling a supplement. Supplement sales are largely scams, even the ones that are "developed by doctors". Also, its name is almost certainly designed to confuse consumers by sounding similar to "Z-Pak", aka azithromycin, which is an antibiotic. I'm not sure why we should expect doctors to be experts on the market forces behind antibiotic use, and there's plenty of reason to be skeptical of that specific doctor's motives.