2021.11.24 – Dr Karl Kruszelnicki, Australian science communicator – Australia is the Skin Cancer Capital of the Universe. Hoorah FOR sunblock – especially now that it’s included in moisturisers & make-up. But if you add to it a different type of sunblock (the two types are “small molecule” such as oxybenzone and “mineral” such as zinc oxide), after a few hours, the effectiveness drops by 85%, not the regular 15%.