Physical sunscreens are advisable for people with sensitive skin. Common ingredients of physical sunscreen are Titanium Dioxide and Zinc Oxide. Parabens They are the artificial preservatives used in skin care products in order to prolong their shelf life. biofit Though they are important to prevent the development of micro organisms in skin care products, but they can be harmful for the skin. It is not advisable to use products that contain a large concentration of parabens. Smaller concentrations of the same are safe though. Stratum Corneum This is the outermost layer of the skin. Skin cells that are formed within the deeper layers of the skin take aboutdays to reach the stratum corneum.