Effervescent Formulation of Oil Palm Leaf Extract as a Free Radical Scavenger Mohamad Fahmi Fairul Azim, Khusnul Khairun Nisa, Sri Hayati, Nisrina Lutfi Apriliani, Achmad Dwi Afandi and Widi Astuti E3S Web Conf., 576 (2024) 06016 Published online: 03 October 2024 DOI: 10.1051/e3sconf/202457606016