- This ingredient’s score is higher if used in products that are inhalable (e.g., sprays, powders) because of respiratory concerns.
- Products with this ingredient are allowed for use in EWG VERIFIED but must meet use restrictions and warnings based on EWG review of company data.
- This ingredient’s score is higher if used in products intended for use around mouth due to increased risk of ingestion and absorption.
- This ingredient’s score is higher if used in products intended for use on lips due to increased risk of ingestion and absorption.
- This ingredient’s score is higher if used in products that will not be immediately rinsed off due to increased risk of absorption.
- Products with the EWG VERIFIED mark have met use restrictions and warnings based on EWG review of company data.
Other ConcernsUse restrictions (moderate), Non-reproductive organ system toxicity (low), Irritation (skin, eyes, or lungs) (high), and Occupational hazards (high)
Restricted: EWG VERIFIED products cannot contain this ingredient without adequate substantiation
Potassium Persulfate is an inorganic salt.
See how this product scores for common concerns.
MODERATEAllergies & Immunotoxicity
LOWDevelopmental and Reproductive Toxicity
- DATA SOURCES
Products with this Ingredient
Irritation (skin, eyes, or lungs)
|Classified as irritant||CPS&Q - Classification & Labelling|
|Violation of industry recommendations - Restricted in cosmetics; use, concentration, or manufacturing restrictions - Safe for brief discontinuous use followed by thorough rinsing||Cosmetic Ingredient Review Assessments|
|Recommended restricted in cosmetics - use, concentration, or manufacturing restrictions - Product type restrictions or differences noted in safety assessment by industry panel||Cosmetic Ingredient Review Assessments|
|Determined safe for use in cosmetics, subject to concentration or use limitations - Safe for use in cosmetics with some qualifications||Cosmetic Ingredient Review Assessments|
|Allowed workplace exposures restricted to low doses||CPS&Q - Classification & Labelling|
|Human skin toxicant or allergen - strong evidence||Cosmetic Ingredient Review Assessments|
|Human any toxicant or allergen - strong evidence||Open scientific literature|
|Limited evidence of immune system toxicity or allergies||CPS&Q - Classification & Labelling|
Organ system toxicity (non-reproductive)
|Classified as toxic or harmful||CPS&Q - Classification & Labelling|
|Classified as not expected to be potentially toxic or harmful||Environment Canada Domestic Substance List|
|Classified as a low human health priority||Environment Canada Domestic Substance List|
|Unknown safety for non-permanent hair dyes||Cosmetic Ingredient Review Assessments|
|Safety unknown for products left on skin||Cosmetic Ingredient Review Assessments|
|Insufficient data to determine safety||Cosmetic Ingredient Review Assessments|
|220 studies in PubMed science library may include information on the toxicity of this chemical||NLM PubMed|
|Occupational hazards related to handling||CPS&Q - Classification & Labelling|
|Industry or government recommendations for safe use: restrictions on concentration, impurities, product types, or manufacturing methods - Safe for brief discontinuous use followed by thorough rinsing||Cosmetic Ingredient Review Assessments|
Multiple, additive exposure sources
|Designated as safe for general or specific, limited use in food||FDA Food Additive Status|
|Designated as safe for general or specific, limited use in food||FDA Everything Added to Food|
|Not suspected to be an environmental toxin||Environment Canada Domestic Substance List|
Persistence and bioaccumulation
|Not suspected to be bioaccumulative||Environment Canada Domestic Substance List|
- CPS&Q (Consumer Products Safety & Quality) formely known as ECB (European Chemicals Bureau). 2008. Classification and Labelling: Chemicals: Annex VI of Directive 67/548/EEC through the 31st ATP.
- CIR (Cosmetic Ingredient Review). 2006. CIR Compendium, containing abstracts, discussions, and conclusions of CIR cosmetic ingredient safety assessments. Washington DC.
- Open scientific/peer reviewed literature
- EC (Environment Canada). 2008. Domestic Substances List Categorization. Canadian Environmental Protection Act (CEPA) Environmental Registry.
- NLM (National Library of Medicine). 2012. PubMed online scientific bibliography data. http://www.pubmed.gov.
- FDA (U.S. Food and Drug Administration) 2006. Food Additive Status List. Downloaded from http://www.cfsan.fda.gov/%7Edms/opa-appa.html, Oct 16, 2006.
- FDA (U.S. Food and Drug Administration). 2008. EAFUS [Everything Added to Food]: A Food Additive Database. FDA Office of Food Safety and Applied Nutrition.
Cosmetics and personal care products are not required to be tested for safety before being allowed on the market. The Skin Deep® scoring system was designed to help the public understand whether a product is safe to use or whether it contains ingredients of concern.
Every product and ingredient in Skin Deep gets a two-part score – one for hazard and one for data availability. The safest products score well by both measures, with a low hazard rating and a fair or better data availability rating.HOW WE DETERMINE SCORES
The Skin Deep ingredient hazard score, from 1 to 10, reflects known and suspected hazards linked to the ingredients. The EWG VERIFIED® mark means a product meets EWG’s strictest criteria for transparency and health.
The Skin Deep data availability rating reflects the number of scientific studies about the product or ingredient in the published scientific literature.