•Blood conducts light. Because of this, if a small portion of it is irradiated, UV will rapidly fill the inside of the body. I originally suspected this because I would see UVBI create instantaneous changes within the body and noticed those changes would disappear the moment I turned off an external UVBI machine (and return once I switched it on), a change which was much faster than irradiated blood could enter the body after being exposed to an external light source. Later, I learned that blood cells have been repeatedly shown to emit light after being exposed to UV.
This observation is an impressive one for me, in that light will circulate in the body for a duration of time on the same basis that a drug or supplements would.
Author
J.R.K