Caprylhydroxamic Acid or CHA is a fairly new preservative and broad spectrum anti-fungal agent with strong chelating properties shown to lower mold growth.
A 2017 study showed a strong link between allergic contact dermatitis - red or itchy skin - and CHA.
Critics of the study noted that participants with damaged skin likely resulted in increased penetration of the CHA on the skin. The Cosmetic Ingredient Review noted that caution should be taken with the use of CHA in a manner that would result in increased penetration, such as formulation with penetration enhancers.
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