EWG Product Search: How Ingredient Ratings and Data Work
A public ingredient database collects product labels, regulatory listings, and scientific studies to rate chemicals in personal care and household items. It assigns hazard-based scores to ingredients, links those scores to product entries, and shows supporting documentation for each rating. The rest of this article explains what data the tool uses, how scores and hazard categories are calculated, practical gaps in the data, how to interpret ratings for different users, and ways to compare similar products when making choices.
What the database covers and where the data comes from
The database focuses on cosmetics, personal care items, cleaning products, and some household goods. Records combine ingredient lists from manufacturer labels and retailer disclosures with external sources. Those external sources include government chemical inventories, public health agency lists, peer-reviewed studies, and industry safety reports. The database also tracks regulatory actions and advisory lists from countries where available. For many entries, reviewers attach citations and excerpts so a reader can trace a rating back to its source.
How ingredient ratings and hazard scores are determined
Each ingredient gets a hazard rating that reflects potential concerns reported in toxicology, occupational studies, or regulatory actions. Ratings are based on the weight of evidence: available studies, official lists that flag a chemical for concern, and documented uses in products. The system separates hazard—what a chemical can do—from exposure, which depends on how a product is used. Scores combine the presence of specific hazard endpoints such as cancer, developmental effects, or skin irritation into a single hazard category.
| Score range | Typical interpretation |
|---|---|
| Low concern | Minimal documented hazard in available sources |
| Moderate concern | Some studies or listings note specific effects or exposure routes |
| High concern | Strong or multiple indications from studies, regulatory lists, or recalls |
The table above simplifies a multi-step decision process. Behind each score is a bibliography of source material and a short rationale. Where original toxicology or exposure studies exist, reviewers note study type and relevance. Where primary studies are missing, the system may rely more heavily on regulatory classifications or expert summaries.
How to interpret ratings for personal circumstances
Hazard ratings describe potential properties of an ingredient, not a personalized risk level. Age, skin sensitivity, frequency of use, and product application method change how likely exposure is. For example, a shampoo used briefly before rinsing typically results in different exposure than a leave-on lotion. Caregivers picking items for children, seniors, or sensitive skin should focus on ingredients linked to irritation or endocrine activity and note whether products are leave-on versus rinse-off. For household cleaners, look at inhalation-related hazards when products are sprayed or used in poorly ventilated spaces.
Steps to compare similar products using the tool
Start by collecting product ingredient lists for the items you want to compare. Look up each ingredient’s hazard rating and supporting notes. Compare products on three axes: the number of higher-rated ingredients, presence of ingredients with specific endpoints you care about, and product use pattern. Pay attention to functional ingredients that are hard to avoid, such as preservatives and surfactants, and compare formulations rather than single components. Where available, filter results by product type, intended use, or certification labels to restrict comparisons to relevant entries.
Practical constraints and data gaps
Data coverage is uneven. Not every product or ingredient is submitted with full ingredient listings, and some formulations include proprietary blends that hide individual chemicals. Exposure information is often estimated rather than measured for every consumer use pattern. International regulatory lists vary in scope and criteria, so a chemical flagged in one country may not appear in another’s lists. Peer-reviewed studies can be scarce for low-volume ingredients, and older studies may use methods that differ from current practice. Those gaps mean that lack of a high score does not necessarily mean an ingredient is risk-free; it may mean limited publicly available information.
Alternatives and additional resources for safety information
Other resources you can consult include government product recalls, national chemical inventories, and independent testing labs that publish product analyses. Nonprofit databases and university extensions sometimes publish exposure assessments and plain-language summaries. For ingredient decisions tied to specific health conditions, professional organizations in dermatology, occupational health, and pediatrics publish position statements that explain clinical contexts. Comparing multiple sources helps clarify consistencies and disagreements across assessments.
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Choosing between products is a matter of priorities and trade-offs. Some shoppers prioritize very low hazard scores for specific endpoints, while others accept certain ingredients because they reduce spoilage or improve performance. Look for products with clear labeling and attached citations. If sensitivity is an issue, prefer rinse-off products or formulations designed for sensitive users and cross-check ingredient notes for common irritants. Remember that ratings are one piece of information: manufacturing quality, storage, and how a product is used all affect outcomes.
This article has described where ingredient scores come from, how those scores are calculated, practical data gaps, and ways to compare items for different needs. Use hazard information together with product type, use pattern, and personal sensitivity when weighing options.
This article provides general information only and is not medical advice, diagnosis, or treatment. Health decisions should be made with qualified medical professionals who understand individual medical history and circumstances.
This text was generated using a large language model, and select text has been reviewed and moderated for purposes such as readability.
