The circulation of cosmetics containing hazardous materials especially mercury has occurred in Indonesia and other countries. The impact has also been felt by the wider community. So far efforts have been made, among others, by searching for and finding new essential ingredients in cosmetic formulas. Mercury in cosmetics leads to the formation of free radicals in the body that must be resisted with antioxidants. Nanogold has been shown to have antioxidant activity. Similarly green tea extracts are also reported to have antioxidant activity. Their combined efforts in cosmetic formulas are expected to increase antioxidant activity. In this study both will be interrogated in advance and tested its antioxidant activity to answer the problem whether the addition of nanogold have an effect on the antioxidant activity of green tea extract? This is particularly important with regard to the application of both in cosmetic formulas. The results obtained by antioxidant activity of green extract of 20 ppm were 91,16% which increased after 1 hour, 2 hours, 3 hours and 4 hours in a row 91,95%; 91.69%; 92.61% and 93.14%. Nanogold various concentrations give unequal effects to the antioxidant activity of green tea extract. At concentrations of 5, 10, 15 and 20 ppm nanogold decreased the antioxidant activity of green tea extract, while the concentration of 20 and 25 ppm of nanogold increased the antioxidant activity of green tea extract. In conclusion to increase the antioxidant activity in cosmetic formulas, the nanogold and green tea extract are included gradually or not simultaneously.

Keywords: nanogold, green tea, antioxidant, formulation, cosmetics.