The increasing consumer awareness on the risk of sun exposure related diseases like skin cancer etc., leads to the sunscreen products be approximately tested and labelled. The efficiency of the sunscreen products depends on the sun protection factor (SPF) value. Due to high cost and time consumption of in vivo SPF determination methods, in vitro methods are gaining more importance. The aim of this study is to determine the sun protection factor (SPF) of sunscreen products by ultraviolet-Visible spectrophotometry. Ten different commercially available sunscreen products of various manufactures were procured and evaluated. The repeatability of the method was tested. It is observed that the proposed spectrophotometric method is simple, rapid and repeatable for the in vitro determination of SPF values of sunscreen products.
