A wearable device that selectively reflects biophotons emitted naturally from the user's body back into the body, achieving beneficial health effects similar to low-level laser therapy without requiring an external laser device. Illustrative wavelengths that may be reflected may include 550 nm, 630 nm, 632 nm, 660 nm, 694 nm, 810 nm, and 980 nm. Radiation of wavelength 810 nm in particular has been shown to affect mitochondrial energy production. The device may be worn for example as a bracelet or pendant. Internal components may include one or more filters to select the desired wavelengths, and a parabolic mirror to reflect these selected wavelengths back into the body. Some embodiments may also include a polarizer so that reflected waves are polarized.