Fig. 5From: A novel film spray containing curcumin inhibits SARS-CoV-2 and influenza virus infection and enhances mucosal immunityCytotoxicity of the curcumin film spray on oral keratinocytes (a), and nasal epithelial cells (b) by MTT assay. The film spray is safe at concentrations of up to 1.56 µg/ml in oral keratinocytes and 12.5 µg/ml in nasal epithelial cells, respectivelyBack to article page