What actually changed in our catalog, cost-per-dose method and pages — dated, so you can see the site is maintained rather than take our word for it. Coverage counts below are live; the log records data and coverage events, never prices.
Most recent change: . Coverage refreshed every 30 minutes.
Our nattokinase page cited a MedlinePlus entry that has 404ed since MedlinePlus retired its natural-products database in July 2025 — the citation was dead while the page still claimed the backing. The dose, evidence and safety text is now sourced to two NIH-hosted peer-reviewed reviews, and the bleeding caution is labelled for what it is: mechanism-based, not trial-based.
Every source listed on a nutrient hub was attributed to the NIH Office of Dietary Supplements, including the ones published by NCCIH, LiverTox, StatPearls and PubMed Central. Publishers are now named correctly, on the page and in the structured data.
The author byline on 97 guides linked to a GitHub profile that does not exist, and the same dead URL was published as the author’s verifiable-identity link in our structured data. The link has been removed rather than pointed somewhere convenient.
Our third-party-testing guide linked to a USP registry page that has since been taken down. It now points at the live USP Verified product listing. Every source we cite is checked against a script on a schedule so a dead citation gets caught instead of ageing quietly.
Combination products were ranked using the single label dose stored against the listing, which belongs to whichever ingredient the product is built around. That put an L-tyrosine bottle at the top of the cheapest-omega-3 ranking, and cayenne pepper at the top of berberine — 55 of 194 shelves had a wrong leader. Rankings now only use a dose the shelf’s own nutrient owns.
Our price-spread study headlined a 2,556x spread for vitamin D3. Both endpoints were listings later quarantined as scrape glitches, so the figure was wrong the moment they were removed — the real spread was 107x. The study, the guides quoting it and the press materials were rewritten onto p90/p10, which one bad row cannot move.
The listing parser read “Pack of 2” as a serving count, so 24 listings showed impossible per-serving costs — and those rows had already fed the published bottle-size and gummy-premium studies (86% became 80%, 2.1x became 1.9x). The rows were quarantined, the parser fixed with regression tests, and the studies recomputed.
Added a GLP-1 companion goal hub — the supplements people on semaglutide/tirzepatide ask about (protein, magnesium, electrolytes, fibre, B12, D), ranked by cost per dose. A value comparison, not medical advice.
Cross-checked every catalog brand against the official public registries. Seven brands hold a verifiable independent certification (USP Verified, NSF Certified for Sport, or Informed Choice) — each now links to its registry entry. Unverifiable "tested" labels were removed; GMP-only brands are no longer marked as third-party tested.
Published a guide: “Third-party supplement testing explained” — what USP, NSF, NSF Certified for Sport and Informed Sport each test, and why “GMP certified” is not the same thing.
Quarantined 158 deals whose scraped price had glitched below a plausible floor, and added a durable guard so a sub-$1 glitch can no longer surface as a “best value” pick or skew the studies.
Tightened the cost-per-dose studies: omega-3 is no longer normalized on total fish-oil weight (only the active EPA+DHA basis), and multivitamin/prenatal/pre-workout blends are excluded from single-nutrient cost percentiles.
Added elemental-content “true cost” tables to the mineral hubs and form-comparison pages — a 1,000 mg magnesium oxide capsule delivers far more elemental magnesium than a 1,000 mg glycinate one, so the label number alone is misleading.
Added “What the evidence shows” sections and a “does it actually work?” answer to the nutrient hubs, quoted and cited from the NIH Office of Dietary Supplements and NCCIH.
Published the /research studies — the supplement price-spread study and the form-premium study — with the underlying figures released free to cite (CC-BY).
Gram-dosed categories (protein, creatine, collagen) are now ranked by cost per gram of active, not per scoop, so a bigger scoop can’t look like better value.
Deepened the nutrient hubs with NIH-sourced food-source, deficiency and safety sections across the catalog.
Why no prices in this log? Cost per dose is our metric, but the raw retailer prices behind it are the retailer’s — we don’t redistribute them or track them over time. How we compute the numbers is on the methodology page.