Glossary
A mild, amphoteric surfactant derived from coconut oil and dimethylaminopropylamine, widely used in gentle cleansers, baby shampoos, and sensitive skin formulations. CAPB produces moderate foam, is less irritating than sodium lauryl sulfate, and was named Contact Allergen of the Year in 2004 by the ACDS.
Cocamidopropyl betaine (CAPB) is one of the most commonly used surfactants (cleaning agents) in "gentle" and "sensitive skin" formulations. Derived from coconut oil, it produces moderate foam, cleans effectively without the harsh stripping action of stronger surfactants like sodium lauryl sulfate (SLS), and has good compatibility with both acidic and basic formulations (amphoteric). It appears in baby shampoos, facial cleansers, body washes, hand soaps, and intimate hygiene products.
CAPB is genuinely milder than SLS or SLES on the skin barrier. It does not strip lipids as aggressively, maintains the acid mantle better, and causes less immediate irritation in patch testing. However, the American Contact Dermatitis Society named it Contact Allergen of the Year in 2004, drawing attention to an increasing number of allergic contact dermatitis cases attributable to CAPB or its manufacturing impurities (dimethylaminopropylamine, DMAPA, and amidoamine).
The contact allergy rate to CAPB is still relatively low (estimated 3 to 7% of patients with suspected contact dermatitis), but it is significant enough to consider when troubleshooting unexplained facial or body rashes in patients using "gentle" or "sensitive" products. The allergy may be to CAPB itself or to impurities left from the manufacturing process. Higher-purity CAPB (produced with better quality control) has lower allergenicity.
Our water-free skincare products contain no surfactants at all, including CAPB. Since surfactants require water to function as cleaning agents, and our products are anhydrous (water-free), the entire surfactant question is irrelevant to our formulation approach. This is one of the advantages of water-free skincare: fewer categories of ingredients to worry about.
It is derived from coconut oil but undergoes significant chemical processing (reaction with dimethylaminopropylamine) to become the final surfactant. It is not a 'natural' ingredient in the way raw coconut oil is, but it originates from a natural source. The distinction between 'naturally derived' and 'natural' matters here.
If you react to CAPB, consider cleansers based on decyl glucoside (sugar-derived, very gentle), sodium cocoyl isethionate (SCI, the main surfactant in Dove bars), or oil-based cleansing methods (oil cleansing, micellar water) that avoid surfactants entirely.
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