Abstract: A consumer electronic device and method for measuring the level of chlorophyll in a human subject. The device comprises a light source that exposes the subject to light to induce fluorescence of the chlorophyll, and a photometer that measures the level of fluorescing chlorophyll. The device may measure the level of chlorophyll without taking a blood or tissue sample, and may be a wearable device. The device may have at least one filter or surface that blocks light of undesired wavelengths or polarity, or selects light of desired wavelengths or polarity. The device may store, communicate, display or use the measured level of chlorophyll over a period of time.

Abstract: Methods of treating a human subject exposed to radiation in space. The methods include the steps of administering to the subject in space a chlorophyll composition sufficient to provide at least about 0.15 ?M of chlorophyll or its metabolites to the subject's bloodstream, and then exposing the subject in space to light having a wavelength of about 620 nm to about 760 nm and an intensity of about 5 W/m2 to about 1000 W/m2 for at least about 5 minutes.