A monthly report on what's trending up, what's saturating, what's quietly declining, and what it means for supplement brands operating on Amazon US. Published the first Tuesday of every month. Written by operators with live client data, not surface-level scrapers.
After five years of compounding growth, the collagen category on Amazon US has flatlined. Search volume is steady but conversion is dropping — and the brands still growing are the ones that stopped pretending they're competing on price.
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