Cocamidopropyl betaine (CAPB) is a surfactant that comes from coconut oil and is used in many personal care and household cleaning products. It helps water bond with dirt and oil, making cleaning easier. CAPB is a non-irritating ingredient for most people, but some individuals can be sensitive to it or the impurities that come from the manufacturing process. In 2004, the American Contact Dermatitis Society declared CAPB the "Allergen of the Year". However, a 2012 scientific review of studies found that its not the CAPB itself that causes an allergic reaction, but two impurities that are produced in the manufacturing process.

CAPB is a synthetic fatty acid made from coconuts, so products that are considered "natural" can contain this chemical. If a person would prefer to avoid CAPB, they can look for products that instead contain coco betaine, which is very mild on the skin and is plant-based.

CAPB has a wide range of uses, including as a cleanser, lathering agent, and thickener. It is found in many personal care products, such as shampoo, body wash, soap, hair conditioner, makeup remover, and liquid body wash, as well as in household cleaning products and laundry detergent.

There is concern that CAPB may be harmful to aquatic life. Manufacturers are required to list CAPB on product labels, and consumers can check the National Institute of Healths Household Product Database to see if a product they use may contain CAPB.

In summary, CAPB is a surfactant derived from coconut oil that is used in many personal care and household cleaning products. It helps water bond with dirt and oil, making cleaning easier. CAPB is a non-irritating ingredient for most people, but some individuals can be sensitive to it or the impurities that come from the manufacturing process. If a person would prefer to avoid CAPB, they can look for products that instead contain coco betaine, which is plant-based and very mild on the skin.