Can I wear makeup when doing a red light therapy session?

Yes, it is fine to wear makeup during a red light therapy session. However, the make-up can theoretically prevent the light from getting through the skin, which can be compensated with a slightly longer treatment time. It is mainly a factor if the face is to be treated specifically and applies to make-up containing particles such as powder and foundations. Products that lack particles but contain UV protection have no effect, as they only stop the shorter-wave UV rays and not red light.