Formulation of Face Serum Combining Pedada Leaf Extract (Sonneratia caseolaris L.) and Kencur Rhizome Extract (Kaempferia galanga L.) As an Antioxidant Cosmetic Preparation

Plants containing natural bioactive compounds with antioxidant activity have the potential to be utilized and formulated into cosmetic products. Pedada (Sonneratia caseolaris L.) leaves, a type of mangrove plant and aromatic ginger (Kaempferia galanga L.) rhizomes are two plants known for their high antioxidant activity. This study aimed to formulate facial serum using a combination of pedada leaves and aromatic ginger rhizome extracts and to evaluate the antioxidant activity of the formulations. The extraction of pedada leaves and aromatic ginger rhizomes was performed using the maceration method with 96% ethanol. Antioxidant activity was determined using the DPPH method. The facial serum was formulated with combinations of pedada leaves and aromatic ginger rhizomes in ratios of 1:1 (F1), 2:1 (F2), and 3:1 (F3). The serum formulations were evaluated for organoleptic properties, homogeneity, pH, viscosity, spreadability, stability, and irritation potential. The results indicated that the IC50 values of pedada leaves and aromatic ginger rhizome extracts were 10.78 ppm and 634.41 ppm, respectively. The best combination was a 3:1 ratio, which yielded an IC50 value of 15.74 ppm. The most effective serum formulation was F2, with an IC50 value of 394.98 ppm. The pH values of serums F0, F2, and F3 were 6.23, 5.72, and 5.43, respectively, and the stability test at 5°C, 28°C, and 40°C for three months showed pH values ranging from 4.5 to 6.5. The viscosity values of serums F0, F2, and F3 were 655, 1810, and 2776 cps, respectively. Acute dermal irritation tests on rabbits indicated that serum formulations F2 and F3 showed no adverse responses