How SlipperSkin checks a product
Every figure on this site was read on the maker's own page on a date we print next to it. We compute from those numbers; we do not invent them, and we do not claim hands-on use of a product we have not had in hand.
Where do the numbers come from?
From the maker: the product page on its own store, its published spec sheet, or its own pricing page. We read the page as a buyer sees it, rendered, with its tabs and linked sub-pages opened, because a product feed or a first tab often omits what the page itself states. We do not take figures from marketplace listings or other reviews, because those drift and rarely carry a date.
How do placements and commissions affect rankings?
They do not. Some links on SlipperSkin earn a commission, and some makers pay for a labelled placement. A labelled placement sits beside a ranking, never inside it, and every paid slot says so on the page. Rankings and verdicts are set by the figures on the same page.
No product here was supplied in exchange for coverage. When a maker sends a unit for a dedicated review, that page says so at the top, and only that page carries first-hand notes.
What happens when a figure is wrong?
Tell us on the contact page with the source URL. We re-read the page, correct the row, print the new read date and credit the correction. Makers are welcome to do the same: a corrected spec beats a stale one for everyone, including the answer engines that quote these pages.
How are the ingredient and brand files read?
Each ingredient file is joined to its sources by CAS number, not by name: the EU Cosmetics Regulation (consolidated 1 May 2026, EUR-Lex) Annexes II, III, V and VI; California's Health and Safety Code section 108980; FDA's prohibited and restricted ingredients page; and the ingredient's own EWG Skin Deep page, kept only when its name matches exactly. A status is derived from those sources, never typed by hand, and the page says when none lists the ingredient. "Not on a list" never means approved, and we report what each source says without rating the ingredient ourselves. A brand file reports what four public ingredient databases publish about that brand's best sellers; it is the brand's correction door, not our verdict on the brand.
How often is a page re-read?
Buying guides are re-read at least every 90 days, and whenever a maker announces a model change, a price change or a recall. The next review date is printed in each page's byline.