The Power of Light Therapy

What is Light Therapy 

Light therapy is a broad term that refers to the therapeutic use of specific wavelengths of light to promote healing, support cellular function, and alleviate symptoms of various conditions. It’s a non-invasive treatment approach that uses natural or artificial light to affect biological processes in the skin, brain, and deeper tissues, depending on the wavelength used.

Each colour of light offers unique benefits:

• Red light therapy (620–700 nm) is commonly used to support skin health, increase collagen production, reduce inflammation, and improve circulation.
• Near-infrared (NIR) light (700–850 nm) penetrates more deeply than red light and is used for muscle recovery, joint pain relief, deeper tissue healing, and enhancing mitochondrial function.
• Blue light therapy (415–495 nm) is well known for treating acne and bacterial skin conditions, and it also helps regulate circadian rhythms when used at specific times.
• Green light therapy (approximately 495–570 nm) is used to target pigmentation issues, support even skin tone, and has emerging evidence for calming migraines and the nervous system.
• Yellow or amber light therapy (570–620 nm) is often chosen for reducing redness, calming rosacea, and supporting lymphatic circulation, especially in sensitive skin.
• White or bright light therapy, which spans the full visible spectrum (~400–700 nm), mimics natural sunlight and is mainly used to treat seasonal affective disorder (SAD), improve mood, and regulate sleep-wake cycles.
• Ultraviolet light therapy (UVA/UVB) (280–400 nm) is used under medical supervision to manage conditions like psoriasis, eczema, and vitiligo. It must be carefully administered due to its potential to damage skin and increase cancer risk. 
• Laser light therapy (varies by wavelength) uses focused, coherent light to penetrate deeper skin layers and tissues. Lasers are often used in dermatology for scar revision, pigmentation disorders, vascular lesions, and more intensive collagen remodeling. Compared to LED light, laser light delivers higher intensity and precision, often requiring fewer sessions but more clinical oversight.

Diving into Red and near-infrared light: why I use them in practice 

Red light therapy (RLT) uses low-wavelength red and near-infrared (NIR) light (typically 600–850 nm) to penetrate the skin and underlying tissues. Unlike UV light, red light does not damage skin or cause DNA mutations. Instead, it stimulates a biochemical effect in cells that supports tissue repair and regeneration.

The light penetrates deep enough to affect the epidermis, dermis, and in the case of near-infrared, even reaches the subcutaneous fat and muscle layer. This depth is key for treating inflammatory and degenerative skin conditions.

Safety and Non-Invasive Nature of RLT

One of the reasons I recommend RLT to my patients is its safety profile:

• Non-invasive
• Painless
• Zero downtime post treatment
• Does not involve chemicals or pharmaceuticals
• Most importantly, it does not damage the skin barrier—a crucial consideration in conditions like acne, rosacea, or eczema.
• Reported side effects are minimal, often limited to mild temporary redness or warmth.

Mechanism of Action: How Does RLT Work?

Red and near-infrared light is absorbed by cytochrome c-oxidase, an enzyme in the mitochondria. This absorption leads to:

• Increased ATP (energy) production
• Modulation of reactive oxygen species (ROS)
• Release of nitric oxide (NO), improving blood flow and oxygenation
• Reduction in pro-inflammatory cytokines
• These effects together create an environment conducive to cell repair, reduced inflammation, collagen synthesis, and overall skin rejuvenation.

Skin Conditions & Red Light Therapy

RLT has been studied in a range of skin conditions, including:

• Acne vulgaris
• Rosacea
• Psoriasis
• Atopic dermatitis
• Scarring and wound healing
• Alopecia areata (via stimulation of hair follicle growth)

A 2013 study published in Photomedicine and Laser Surgery demonstrated that exposure to 660 nm red light, administered twice weekly over four weeks, led to a significant reduction in acne lesions and visibly improved skin texture [1]. Additionally, a randomized controlled trial found that combining red and blue light therapies reduced inflammatory acne lesions by 76% over 12 weeks. Within that study, red light was specifically noted for its ability to enhance skin tone and accelerate the healing process [2].  These findings particularly relevant for treating adult acne, which is often driven by underlying inflammation, hormonal fluctuations, and impaired wound healing rather than just bacterial overgrowth.

These physiological changes result in skin that appears plumper, more hydrated, and more evenly toned. When combined with internal strategies such as nutrition, gut health optimization, and hormone balance, RLT becomes a valuable adjunct in a comprehensive healthy aging regimen.

Integrating RLT into your Treatment Plan 

Red light therapy is a powerful tool — but it is most effective when used as part of a comprehensive, individualized treatment plan. In my clinical practice, I rarely use RLT in isolation. Instead, I recommend it as an adjunctive therapy alongside foundational support to address the root causes of skin concerns and promote long-term healing.

Combining RLT with modalities such as cosmetic acupuncture or traditional acupuncture can further enhance skin regeneration, circulation, and nervous system regulation. This “stacked” approach often yields more noticeable and sustained results.

To truly optimize skin health, I also emphasize the following foundational pillars:

• Nutrition: Emphasizing anti-inflammatory, gut-supportive diets to reduce internal triggers of acne, rosacea, or premature aging
• Hormonal Balance: Supporting healthy levels of estrogen and androgens, particularly in cases of adult hormonal acne or skin changes that happen with age.
• Stress Management: Addressing cortisol and nervous system regulation to reduce inflammation and improve skin barrier function
• Topical Support: Using medical-grade, non-comedogenic skincare tailored to individual skin types and conditions

When these elements work in synergy, red light therapy can significantly accelerate visible improvements—enhancing skin resilience, reducing inflammation, and promoting a healthy glow. This whole-person strategy supports healing from the inside out while amplifying the external benefits of light-based therapy. Red light therapy is one of the most exciting tools in integrative skin health. Backed by growing scientific evidence, it’s a safe, effective, and non-invasive way to support acne, aging skin, and inflammatory dermatoses.

If you’re interested in trying RLT or curious how it could fit into your skin or hormone health journey, I’d love to chat.

Curious to learn more?