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C-terminal amidation, as seen in Nle-Tyr-Ile-His-NH, also provided a more modest increase in stability
For oily skin, the best glycolic acid forms are gels, toners, or serums in lower concentrations (around 2-5%) for daily use, or stronger toners (like 7%) a few times a week, as these formulas penetrate well and offer effective exfoliation without heaviness
1992 Nov;120(5):720-5
doi: 10.1016/j.agwat.2017.08.004 2 AbdelhamidM
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