There is not yet an agreed upon scientific definition of a "bond builder" for hair. The present authors propose the following definition: “a formulation component that is able to penetrate into the hair and improve or restore the internal structure of hair, giving rise to an improvement in hair mechanical properties.”
Bond builders are trending in hair care. So how do they work? This article explores the cross-linking bonds present in hair, how they are affected by damage and the ways in which cosmetic actives can alter them to improve hair properties. It also proposes paths forward in this engaging space.
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