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    GlossaryPenetration

    ability of a substance to pass through skin or hair

    Penetration, in the context of hair and scalp treatments, refers to the ability of a substance to pass through the outer layer of the skin or hair shaft to reach deeper layers. This is crucial for the effectiveness of topical treatments, such as minoxidil for hair growth, as it ensures that active ingredients can reach the hair follicles where they exert their effects.

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