<![CDATA[Red seaweed (Gelidium Sp.) is one type of seaweed found in Indonesia and contains antioxidant compounds. Red seaweed (Gelidium Sp.) has catechin compounds which are strong antioxidants, stronger than vitamin E, C, and beta-carotene. The purpose of this study was to determine if red seaweed extract (Gelidium sp) could be used in a face serum with antioxidant activity, and subsequently, to identify the best formula among the developed preparations.Face serum is a preparation that is applied to the face to avoid treating facial skin. This research was an experimental study by extracting red seaweed (Gelidium Sp.) which is carried out using the maceration method, then made with different concentrations of red seaweed extract (Gelidium Sp.) namely 5%, 7.5%, 10%. Testing of the preparation includes organoleptic tests, homogeneity tests, pH tests, viscosity tests, spreadability tests, and DPPH tests. The results obtained indicate that formula III fullfil the requirements. Antioxidant activity can be effectively demonstrated in face serum preparations formulated with red seaweed extract (Gelidium sp.), and the optimal formulation, Formula III, is achieved with a 10% extract concentration ]]>
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