Explainers, playbooks, market analyses, and audit case files on selling supplements on Amazon US. Written by operators, not SEO writers.https://www.fussypenguins.com/https://www.fussypenguins.com/blog/dietary-supplement-listing-act-2026/https://www.fussypenguins.com/blog/dietary-supplement-listing-act-2026/What the Dietary Supplement Listing Act of 2026 (S.3677 / H.R. 8370) would require, the timeline, the industry split, and what it means for supplement sellers.Mon, 29 Jun 2026 00:00:00 GMThttps://www.fussypenguins.com/blog/75-character-supplement-title-amazon/https://www.fussypenguins.com/blog/75-character-supplement-title-amazon/Amazon's 75-character title cap lands July 27, 2026. Here's the exact slot-by-slot anatomy of a supplement title that ranks, gets recommended by the AI shopping assistant, and stays compliant — and where the overflow goes.Thu, 18 Jun 2026 00:00:00 GMThttps://www.fussypenguins.com/blog/reinstate-supplement-listing-cgmp/https://www.fussypenguins.com/blog/reinstate-supplement-listing-cgmp/If Amazon deactivated your supplement listing for a cGMP issue, the fastest path back is documentation, not argument — a current third-party cGMP certificate, a batch COA, and a one-page plan of action that names the root cause and the fix.Sat, 06 Jun 2026 00:00:00 GMThttps://www.fussypenguins.com/blog/amazon-supplement-listing-suppressed-fix/https://www.fussypenguins.com/blog/amazon-supplement-listing-suppressed-fix/If Amazon suppressed your supplement listing under the March 2026 ingredient claims rule, the fix is almost always a catalog data problem — not an account problem. Most listings reactivate within 24–72 hours once the fix touches every field the bad claim appears in.Mon, 18 May 2026 00:00:00 GMThttps://www.fussypenguins.com/blog/001-acos-wrong-metric/https://www.fussypenguins.com/blog/001-acos-wrong-metric/Every supplement brand on Amazon is being measured on a metric that doesn't actually describe whether they're making money. This is a problem, and it's been getting worse.Wed, 15 Apr 2026 00:00:00 GMThttps://www.fussypenguins.com/audit-library/al-2026-001-suppression-rescue/https://www.fussypenguins.com/audit-library/al-2026-001-suppression-rescue/Brand's highest-revenue ASIN was suppressed after a routine Amazon claims review flagged language in the bullets that had been live for 14 months without issue. The audit revealed the same vulnerability in three additional ASINs — all fixed before Amazon noticed.Wed, 08 Apr 2026 00:00:00 GMThttps://www.fussypenguins.com/market-analyses/001-collagen-plateau/https://www.fussypenguins.com/market-analyses/001-collagen-plateau/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.Wed, 01 Apr 2026 00:00:00 GMThttps://www.fussypenguins.com/blog/002-supplement-suppression-taxonomy/https://www.fussypenguins.com/blog/002-supplement-suppression-taxonomy/Listing suppressions feel random when they happen. They aren't. Here's the actual taxonomy of what gets supplement listings suppressed on Amazon, and the patterns that cause repeat offenders.Sat, 28 Mar 2026 00:00:00 GMThttps://www.fussypenguins.com/audit-library/al-2026-002-ppc-margin-leak/https://www.fussypenguins.com/audit-library/al-2026-002-ppc-margin-leak/Brand's ACoS looked fine at 28% — right in line with category averages. The audit revealed that three of twelve ASINs were running PPC at a net loss after FBA fees and COGS, masked by two high-margin products that were subsidizing the rest.Wed, 11 Mar 2026 00:00:00 GMThttps://www.fussypenguins.com/market-analyses/002-probiotics-bifurcation/https://www.fussypenguins.com/market-analyses/002-probiotics-bifurcation/The probiotics category has two distinct stories in 2026 — a stagnant generic mid-tier and an accelerating premium segment. The winners are the brands treating probiotics like a medical category, not a wellness trend.Wed, 04 Mar 2026 00:00:00 GMT