Photobiomodulation: everything you need to know about light therapy

Definition of photobiomodulation (PBM)

Photobiomodulation (PBM), also known as low-level laser therapy (LLLT), is a non-invasive therapeutic technique that uses red and near-infrared light (630-1000 nm) to stimulate cell regeneration. By acting on the mitochondria via cytochrome c oxidase, it promotes ATP production and triggers clinically proven analgesic, anti-inflammatory, and healing effects.

Mechanisms of action

Photobiomodulation is based on a fundamental principle of photochemistry: the selective absorption of light by cellular chromophores. The main receptor identified is cytochrome c oxidase, an enzyme in the mitochondrial respiratory chain.

When red or near-infrared light photons reach this enzyme, they trigger a cascade of reactions:

• Stimulation of ATP (adenosine triphosphate) production, the cellular "fuel"
• Release of nitric oxide, improving local blood circulation
• Modulation of reactive oxygen species (ROS)
• Activation of cellular signaling pathways promoting tissue repair

Unlike surgical lasers, photobiomodulation uses athermic energy levels: the temperature of the tissues does not increase significantly. This is why it is also referred to as "cold laser" or low-level light therapy.

Clinical applications

• Oncology: prevention/treatment of mucositis (oral inflammation), radiodermatitis, and neuropathies associated with chemotherapy
• Pain: chronic pain, osteoarthritis, tendinitis, low back pain, fibromyalgia, neuropathic pain
• Dermatology: wound healing, diabetic ulcers, acne, rosacea, psoriasis, eczema
• Aesthetics: photorejuvenation, collagen stimulation, reduction of wrinkles, stretch marks, pigmentation spots
• Gynecology: Genitourinary syndrome of menopause, vaginal dryness, pelvic pain, endometriosis
• Hair: androgenetic alopecia, stimulation of hair regrowth (effect discovered by Endre Mester in 1967)
• Dental: toothache, gum inflammation, post-extraction healing, peri-implantitis

FAQ

What is photobiomodulation?

Photobiomodulation (PBM) is a non-invasive therapy that uses red and near-infrared light to stimulate cell regeneration. It acts on the mitochondria to produce analgesic, anti-inflammatory, and healing effects without any thermal effect.

How much does a photobiomodulation session cost?

In France, a single session lasting 15 to 30 minutes costs between €50 and €150 depending on the technology used and the area treated. Packages of 5 to 10 sessions range from €250 to €1,000, offering a sliding scale of prices for complete courses of treatment.

What are the side effects of photobiomodulation?

Photobiomodulation is generally very well tolerated. Side effects are rare and mild: slight temporary redness, local sensation of heat. There is no thermal effect or tissue damage at therapeutic doses.

Who can practice photobiomodulation?

Sessions may be conducted by physicians or trained paramedical professionals (nurses, physical therapists, radiation therapists). Professional devices must comply with the ISO 13485 medical standard.

Is photobiomodulation covered by insurance?

Currently, photobiomodulation is not covered by Social Security in France. Some mutual insurance companies may cover part of the costs as part of "alternative medicine" or "supportive care" packages.

What are the contraindications for photobiomodulation?

The main contraindications include: active untreated cancer (area to be treated), pregnancy (abdominal area), photosensitive epilepsy, photosensitizing medications. Prior medical advice is recommended.