BO BIOMEDICA exhibited negligible absorption in the wavelength of interest (300–400 nm), i.e. the UVA and longer UVB light. For this substance, no phototoxicity was detected up to the highest concentration tested using either in vitro or in vivo tests. Similar results were obtained for BO AROMA. Only in the highest concentration tested in the H3D PT assay (3.16% in sesame oil) was revealed phototoxic response. This result may be related either to the differences in experimental tissue batches, or impurities present in the BO AROMA, indicated by the increase in the absorption spectrum around 280–290 nm