Check what is actually in that product.

The screening data comes from the EPA's ToxCast program, part of the Computational Toxicology and Exposure (CompTox) Dashboard. ToxCast runs chemicals through hundreds of laboratory assays to flag biological activity for research prioritization. We also check three active health agency watchlists: California's Proposition 65 list, the WHO's IARC carcinogen classifications, and the EU's ECHA Substances of Very High Concern list. We additionally cross-reference the TEDX endocrine disruptor database as a historical supplement (TEDX ceased operations in November 2019).

The EPA runs hundreds of lab tests on chemicals through the ToxCast program. Each test checks whether a chemical produces a measurable biological response, such as interacting with a hormone receptor or affecting cell growth. "Active" means the chemical triggered a statistically significant response in that particular test. A higher number of active tests means the chemical interacted with more biological targets in screening, but this is lab data used for research prioritization. It does not directly tell you what happens in the human body at the levels found in everyday products. Dose, exposure route, and how your body processes the substance all matter.

The EPA CompTox Dashboard catalogs more than 1.3 million chemical records, but ToxCast screening has only been performed on a subset of them (roughly 10,000). If a chemical shows 0 assays, it means the EPA has not yet run high-throughput screening on it. This does not mean the chemical has been evaluated and cleared. It means it has not been tested through this particular program.

No. The ToxCast percentage is not a product rating or verdict. The EPA describes ToxCast as "in vitro screening data for prioritization and hazard characterization." It tells researchers which chemicals warrant further study, not whether a finished product poses a specific risk to consumers. The reference-list matches (Prop 65, IARC, ECHA) show where active regulatory agencies have made formal determinations, but even those depend on dose and exposure context. TEDX data is shown as a historical supplement. This tool surfaces the data so you can see it for yourself.

Prop 65 is California's list of chemicals known to cause cancer or reproductive toxicity (~900 chemicals). IARC is the World Health Organization's cancer classification system (Group 1 = confirmed carcinogen, Group 2A = probable, Group 2B = possible). ECHA SVHC is the EU's list of Substances of Very High Concern under the REACH regulation. These three lists are actively maintained by their respective agencies. TEDX (The Endocrine Disruption Exchange) cataloged chemicals with evidence of hormone-disrupting properties, but the organization ceased operations in November 2019. We include TEDX as a historical reference because its research remains useful, but it is no longer updated. A match means the chemical appears on that list. No match means it was not found, not that it has been evaluated and cleared.

You can scan a product barcode (using your phone camera), photograph the ingredients label (using on-device text recognition), or search by product name. The checker looks up the ingredient list from open data sources (Open Food Facts, USDA, or our own curated product data), then matches each ingredient against the same watchlists used in the chemical search. Your label photos and ingredient text stay on your device. Anonymous usage analytics help improve the tool.