Last updated: 31 October 2026
Stacking Years Evidence Check is a Chrome extension made by Stacking Years (stackingyears.com).
The extension does not collect, store, send, sell or share any personal or usage data. It has no analytics, ads, trackers or accounts.
On iHerb, Walmart and Vitacost product pages, the extension reads the product title inside your browser. On Google search results, it reads your search words. It checks them against the supplements we cover and, if one matches, shows a small panel with our evidence grade. This text never leaves your device. All grade data is built into the extension; it loads nothing from the internet. It does not change any page, price or link, and it does not run on other websites.
The panel and popup link to stackingyears.com. If you click one, our website's privacy policy applies.
This extension is not affiliated with, endorsed by or sponsored by iHerb, Walmart, Vitacost, Google or any other store or search engine. All trademarks belong to their owners.