Humic acids (HA) are known for their antiviral and UV-B protecting effects. and are considered promising as ingredients for a UV-protective lipstick which is being developed to minimise or even prevent recurrences of UV- induced herpes. In this study. the UV/Vis spectra of three natural HA and three synthetic HA-like substances are analysed to determine the appropriateness of their UV... https://parisnaturalfoodes.shop/product-category/active-collagen/