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Zinc pyrithione concentration of up to 2% is allowed for products when they are formulated to be applied and then washed off after brief exposure. Alternatively, up to 0.25 percent when formulated to be left on the skin or scalp [20]
Cocamidopropyl betaine is used as a foam booster in shampoos. [4] It is a medium-strength surfactant also used in bath products like hand soaps.It is also used in cosmetics as an emulsifying agent and thickener, and to reduce the irritation that purely ionic surfactants would cause.
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