This invention refers to the use of a Bismuth inorganic salt, specifically, Bismuth Oxychloride as sun protection agent, and to the synthesis methods to obtain optimized Bismuth Oxychloride with specific photoprotecting features ensuring optimum stability, effectiveness and safety for the protection against skin and/or hair, and/or facial hair, and/or body hair damage caused by UV solar radiation. Furthermore, different compositions with effective and safe concentrations of Bismuth Oxychloride are described. These compositions exhibit protection values above those commonly obtained from organic and inorganic agents known in the state of the art, all along the ultraviolet spectrum (290 to 400 nm). This physically and chemically characterized compound, with critical wavelengths above 380 nm, is a "broad spectrum" sunscreen.
