Sunscreen additives for enhancing vitamin D production

A method, comprising:

• selecting one or more phosphor materials to incorporate into one or more zinc oxide particles in a sunscreen composition, wherein the one or more phosphor materials are capable of carrying out an up-conversion process;
• incorporating the one or more selected phosphor materials into the one or more zinc oxide particles to create the sunscreen composition;
• and
• enabling one or more iterations of the up-conversion process whereby (i) two or more photons within a wavelength range of between approximately 350 nanometers and 400 nanometers are absorbed by the one or more zinc oxide particles, (ii) the two or more photons absorbed by the one or more zinc oxide particles are up-converted by the one or more phosphor materials, resulting in at least one photon within a wavelength range of between approximately 270 nanometers and 300 nanometers, and (iii) the at least one photon within a wavelength range of between approximately 270 nanometers and 300 nanometers is emitted from the sunscreen composition to be absorbed by skin of a human user of the sunscreen composition.