Red light therapy has an excellent safety profile, but there are some precautions to be aware of.

Is Red Light Therapy Safe?

Yes, for the vast majority of people. RLT:

  • Doesn’t use UV light
  • Doesn’t cause burns
  • Doesn’t damage DNA
  • Has thousands of studies supporting safety

Potential Side Effects

Rare and Mild

  • Eye strain — From looking at bright LEDs
  • Skin sensitivity — Some people have light sensitivity
  • Headache — Rare, usually from eye strain
  • Insomnia — If used too late in the day

Very Rare

  • Photosensitivity reaction — In people taking photosensitizing medications
  • Hyperpigmentation — In rare cases with excessive use

Who Should Be Cautious

Consult Doctor First

  • Pregnant — Insufficient safety data
  • Photosensitizing medications — May increase sensitivity
  • Active cancer — Theoretical concern about stimulating cell growth
  • Epilepsy — Flashing lights may trigger seizures (steady light is usually fine)

Generally Safe But Be Aware

  • Fair skin — May be more sensitive to light
  • Eye conditions — Use protective goggles
  • Children — Use lower doses, shorter sessions

Safety Tips

1. Don’t Stare at LEDs

  • Close eyes during face treatments
  • Use protective goggles if included
  • Position device to avoid direct eye exposure
  • Don’t exceed recommended session times
  • Maintain proper distance
  • Don’t use more than once daily per area

3. Start Gradually

  • Begin with 5-minute sessions
  • Increase to 10-20 minutes over weeks
  • Monitor your skin’s response

4. Check Your Medications

Some medications increase light sensitivity:

  • Tetracycline antibiotics
  • Retinoids
  • Some heart medications
  • St. John’s Wort

The Bottom Line

Red light therapy is one of the safest therapeutic interventions available. Side effects are rare and mild. Follow basic precautions, and it’s safe for daily use by most people.