--- title: "Cocamidopropyl betaine" description: "Cocamidopropyl betaine is used in cleansers and shampoos. Understand its cleansing role, impurity-related allergy concerns and finished-formula limits." --- # Cocamidopropyl betaine > Cocamidopropyl betaine is used in cleansers and shampoos. Understand its cleansing role, impurity-related allergy concerns and finished-formula limits. Source: https://cosmetic-labs.com/glossary/cocamidopropyl-betaine Created: 2026-11-09T14:45:48+00:00 Modified: 2026-11-09T14:45:48+00:00 Author: Emilie SCHOL ## Definition of Cocamidopropyl betaine Cocamidopropyl betaine (CAPB) is an amphoteric [surfactant](https://cosmetic-labs.com/glossary/surfactant) used in cleansing formulas. The reported ingredient-level safety conclusion is conditional on avoiding sensitizing levels of manufacturing impurities; the name alone cannot establish that a finished product is non-allergenic. ### Learn more ## What the ingredient is for Cocamidopropyl betaine, abbreviated CAPB, belongs to the amidopropyl betaine family of surfactants. Formulators use this kind of ingredient in wash-off systems to help disperse oily soil in water and adjust the feel and foam of a cleanser. It often appears beside other surfactants in a shampoo, body wash or facial cleanser rather than as the sole cleaning agent. The list of ingredients reveals neither the finished-product concentration nor how the surfactant blend performs on a particular person. ## Why impurities matter The name CAPB identifies the intended ingredient but does not disclose all trace constituents of a supplied raw material. Manufacturing-related 3-dimethylaminopropylamine, abbreviated DMAPA, and an amidopropyl dimethylamine intermediate have been considered in sensitization assessments. The key distinction is between irritant symptoms from an overall wash formula and allergic contact sensitization associated with exposure to an allergen. A reaction to a product cannot be diagnosed from the ingredient list alone: other ingredients and the supplied material may be relevant. ## What human patch-test findings mean A study recruited 30 Japanese patients who already had scalp dermatitis and positive patch tests to CAPB and/or a related betaine. Patch tests to DMAPA and lauramidopropyl dimethylamine were positive to either or both in 15 of the 30. That is evidence that these substances may matter in this selected clinical group; it is not an estimate that half of all shampoo users are allergic. The study was a small, selected patient sample and the tested impurity included a lauryl-related amidoamine rather than proof that every CAPB batch contains the same exposure. ## Safety assessment and formulation practice A completed assessment, later recounted in a final related-ingredient review, considered impurity levels and a quantitative risk approach to sensitization. Its conditional conclusion should not be flattened into “CAPB is always hypoallergenic.” Raw-material purity, the amount used, the final product and expected exposure are all relevant to evaluation. A supplier specification and appropriate finished-formula testing are more informative to a formulator than an unqualified marketing statement about the ingredient. A rinse-off label does not make an established allergy irrelevant. ## Choosing a cleanser with a suspected allergy If a cleanser repeatedly triggers an itchy or eczematous reaction, stop using it and seek clinical assessment if symptoms persist; patch testing under professional supervision can help distinguish suspected allergens. Do not assume that merely replacing CAPB with another surfactant will fix every reaction. Conversely, the existence of documented allergy in selected patients does not mean all users should avoid CAPB. Ingredient function, allergic susceptibility, raw-material quality and finished-product tolerability are different layers of evidence. Sources ## Sources and references References supporting this page are listed below. Source access dates and supported claims are recorded in the evidence notes where available. [Final CIR report recounting CAPB impurity concerns](https://www.cir-safety.org/sites/default/files/amidoa062014final.pdf) URL [https://www.cir-safety.org/sites/default/files/amidoa062014final.pdf](https://www.cir-safety.org/sites/default/files/amidoa062014final.pdf) [Final CIR report recounting completed CAPB assessment](https://www.cir-safety.org/sites/default/files/amidoa062014final.pdf) URL [https://www.cir-safety.org/sites/default/files/amidoa062014final.pdf](https://www.cir-safety.org/sites/default/files/amidoa062014final.pdf) [Iijima et al. 2023 abstract, Europe PMC MED record](https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID%3A37550079%20AND%20SRC%3AMED&format=json&resultType=core) URL [https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID%3A37550079%20AND%20SRC%3AMED&format=json&resultType=core](https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID%3A37550079%20AND%20SRC%3AMED&format=json&resultType=core) --- ## Site identity - Organization: Cosmetic Labs - Description: Cosmetic Labs is a directory and a platform to meet all your cosmetic product development needs. From sourcing raw material to finding the best CRO for your needs. - Website: https://cosmetic-labs.com