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 18, 2020 at 10:36 pm #1842 bpbaddieParticipant @yayanyayan – I agree with this. I suggest to consult the doctor first if they found some negative effects. So far of using this have you encountered some bad effects?