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Our gold standard 5% L-Mandelic Serum is an alpha hydroxy acid serum that contains the chirally correct versions of both l-mandelic acid and l-lactic acid. L-Mandelic acid has a larger molecular weight than other alpha hydroxy acids slowing down epidermal penetration resulting in a more even exfoliation with less irritation. This water-based serum is recommended for skin prone to inflamed acne, noninflamed acne, fungal folliculitis, and hyperpigmentation.