Light Therapy for Skin Health & Beyond

Skin health is often discussed in cosmetic terms, yet the skin’s role goes far deeper than surface-level. It is the body’s largest organ, a complex sensory interface, a critical immune barrier, and a reflection of holistic health including inflammation levels, hormonal balance, circulation, cellular energy, and nervous system regulation in response to stress.

LED light therapy is widely used in skincare and, more recently, has found a place in wellness protocols, because it supports biological repair, regeneration, and resilience on a cellular level. When used consistently and correctly, LED therapy offers a non-invasive, evidence-informed approach to improving skin appearance and function to support wider biological systems.

This article explores how LED light therapy supports the skin, and how it can play a wider role in long-term holistic health rather than simply quick aesthetic fixes.

How Light Therapy Works at a Cellular Level

When delivered at specific wavelengths, light causes changes in the skin. The most widely understood instance of this is UV light which, with overexposure, can cause changes to DNA and cancer.

However, there are many more wavelengths of light, most of which are harmless, or beneficial when used correctly. Such as photobiomodulation which uses non-UV visible light to influence cellular behaviour. Photobiomodulation includes the wavelengths for red, blue, and green light, which each offer unique and complementary benefits for skin clarity, tone, repair, and resilience.

Unlike UV light, red, blue, and green wavelengths used in clinical settings do not damage DNA (Hamblin, 2017).

Red Light: Repair & Rejuvenation

Red light is the most extensively researched wavelength and is the most widely used in therapeutic settings.

Red (630–660 nm) and near-infrared (810–880 nm) wavelengths penetrate into the deeper layers of the skin, where they interact with the mitochondria (the energy centres of our cells). This interaction supports:

·       Increased cellular energy (ATP) production

·       Improved circulation

·       Healthier collagen signalling

·       Balanced inflammatory response

(Hamblin, 2017; Avci et al., 2013).

In simple terms, red light helps skin cells function more efficiently, which is foundational to repair and renewal.

Supporting Collagen & Elasticity

Red light stimulates fibroblasts which are the cells responsible for producing collagen and elastin. Clinical studies published in Dermatologic Surgery and Lasers in Surgery and Medicine demonstrate improvements in skin texture, elasticity, and fine lines with consistent use (Avci et al., 2013).

Unlike aggressive resurfacing treatments, red light supports structural integrity without compromising the skin barrier.

Calming Inflammation & Sensitivity

Red light has also been shown to help regulate inflammatory pathways (Farivar et al., 2014), making it particularly supportive for:

·       Sensitive or reactive skin

·       Rosacea-prone skin

·       Post-treatment redness

·       Acne-related inflammation

With consistent use, red light therapy supports healing and reduces redness, for calmer, more resilient skin.

Blue Light: Clarifying Acne-Prone Skin

Blue light (approximately 405–470 nm) works differently to red light.

It targets Cutibacterium acnes, the bacteria involved in inflammatory breakouts. These bacteria absorb blue light, which helps reduce their activity. Clinical studies in Journal of Clinical and Aesthetic Dermatology show reductions in inflammatory acne lesions with consistent blue light use.

However, blue light primarily addresses bacterial load. It does not directly support healing or reduce inflammation, which is why it is most effective when paired with red light therapy.

Together:

·       Blue light helps clarify active breakouts

·       Red light supports healing and reduces redness

This layered approach treats both the cause and the after-effects of acne.

Green Light: Supporting Even Tone & Pigmentation

Green light (approximately 520–560 nm) seems to work within the skin and affects cell function.

Melanocyte are the cells responsible for pigment production, and emerging research suggests green wavelengths may help regulate melanocyte activity to support improvements in:

·       Uneven skin tone

·       Hyperpigmentation

·       Redness or blotchiness

While research in this area continues to evolve, early findings in aesthetic and phototherapy literature suggest green light can support and refine overall tone when used consistently.

Green light is also often experienced as visually calming, which may support stress-related skin reactivity.

The Skin & Nervous System Connection

The skin, as a complex sensory interface and immune barrier, is intrinsically linked to the nervous system. Chronic pain and stress can elevate cortisol and inflammation, impair barrier repair and immune response, and inhibit collagen production.

By supporting cellular energy and calming inflammatory pathways, red and green light may indirectly assist in restoring balance, not only in the skin, but the nervous system. Many clients report not only visible improvement in their skin, but also a sense of calm during and after treatment, reflecting this intrinsic connection between the skin and nervous system.

A Multi-Wavelength Approach

Light therapy can be used as an effective tool in long-term skin health strategies and to support natural biological rhythms. Each wavelength supports a different layer of skin physiology to address a range of concerns:

·       Blue light clarifies acne-prone skin, usually triggered by hormonal changes

·       Red light strengthens collagen and supports repair, for youthful-looking skin

·       Green light helps refine tone and pigmentation, for skin radiance

Healthy skin reflects cumulative care and holistic wellbeing beyond aesthetics. Consultation and consistency are key.

At Sôlt Haus, each appointment starts with a conversation around individual skin condition, concerns, lifestyle and wellness goals. We tailor each light therapy session to your personal needs, which may involve single or multiple wavelengths, across a single or series of sessions.

References

·       Avci, P., Gupta, A., Sadasivam, M., et al. (2013). Low-level laser (light) therapy in skin: stimulating, healing, restoring. Dermatologic Surgery, 39(2), 179–202.

·       Hamblin, M. R. (2017). Mechanisms and applications of photobiomodulation. Photomedicine and Laser Surgery, 35(4), 163–165.

·       Farivar, S., Malekshahabi, T., & Shiari, R. (2014). Biological effects of low level laser therapy. Lasers in Medical Science, 29(2), 425–435.

·       Gold, M. H., et al. (2011). Clinical efficacy of blue light therapy for inflammatory acne. Journal of Clinical and Aesthetic Dermatology, 4(8), 22–27.