Reply To: Does RLT have side effects? Home › Forums › Red Light Therapy › Does RLT have side effects? › Reply To: Does RLT have side effects? November 16, 2020 at 12:34 pm #1695 MarianneParticipant Personally speaking, I have not any bad effects after using RLT for several months now. Aside from the energy I am getting and being hyper, I cannot think of anything else lol.