Can red light therapy be harmful if used incorrectly?

Nancy Moore 1
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What are the specific consequences of "overdosing" on light energy?

safety-side-effects
1 Answers
Yes, red light therapy can be harmful or counterproductive if used incorrectly, primarily due to the principle of the biphasic dose response. This biological law states that a low dose of a stimulus (light) produces a positive effect, a moderate dose produces the maximum benefit, but a high dose inhibits the effect or causes damage. "Overdosing" on RLT doesn't mean radiation poisoning in the traditional sense, but rather delivering too much energy (Joules) to the cells.
Consequences of incorrect use include:
  1. Cellular Inhibition: Excessive energy can overwhelm the mitochondria, leading to a decrease in ATP production rather than an increase. This can stall healing processes, making the therapy ineffective or even slowing down recovery.
  2. Thermal Injury: While LEDs are cool, high-power arrays used for too long or placed too close to the skin can generate cumulative heat. This can cause mild burns, blistering, or exacerbation of heat-sensitive conditions like melasma or rosacea.
  3. Eye Damage: The most serious risk of incorrect use is staring directly into high-intensity NIR LEDs without protection. This can cause thermal damage to the retina, potentially leading to blind spots or reduced vision, as the eye's natural blink reflex doesn't trigger for invisible NIR light.
  4. Headaches and Dizziness: Some users report headaches or nausea after excessively long sessions, possibly due to the intense stimulation of cranial blood flow or mitochondrial activity in the brain.
  5. Aggravation of Conditions: As mentioned, using RLT over active cancers or undiagnosed lumps could theoretically stimulate unwanted cell growth.
Incorrect usage also includes using damaged devices that might flicker (triggering seizures in susceptible people) or emit stray UV. Therefore, adhering to recommended times, distances, and safety gear is not just about optimization; it is about preventing these tangible harms. More is definitely not better in the world of photobiomodulation.
Nancy Moore1
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