Combining Natural Ingredients to Optimise Antioxidant Content in Brewing Herbal Drinks Sentot Joko Raharjo, Tarsisius Dwi Wibawa Budianta and Paini Sri Widyawati BIO Web Conf., 98 (2024) 01004 Published online: 28 March 2024 DOI: 10.1051/bioconf/20249801004