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  2. Hyaluronic acid - Wikipedia

    en.wikipedia.org/wiki/Hyaluronic_acid

    Hyaluronic acid (/ ˌ h aɪ. ə l j ʊəˈr ɒ n ɪ k /; [1] [2] abbreviated HA; conjugate base hyaluronate), also called hyaluronan, is an anionic, nonsulfated glycosaminoglycan distributed widely throughout connective, epithelial, and neural tissues.