Optimization of blend formulation of agar/κ-carrageenan hydrogels for transdermal delivery of vitamin B12Paul Jake Nalzaro, China Nicole Alterado, Tina Marie Ong, Camille Ann Venturina and Terence TumolvaE3S Web Conf., 679 (2025) 01032DOI: https://doi.org/10.1051/e3sconf/202567901032