Red Light and Collagen: Mechanism, Studies & Protocol

Collagen is the protein that keeps the skin firm, smooth and resistant to wrinkles, and after the age of 25 its production declines every year. Red light in combination with near-infrared light can re-activate fibroblasts and support the production of type I and III collagen. In this article we explain in detail the mechanism, the specific wavelengths, what clinical studies say and what a practical therapy protocol looks like.

What you will learn

• Mechanism step by step: how red and infrared light activates cytochrome c oxidase (CCO) in the mitochondria of fibroblasts and triggers ATP and collagen production
• Wavelengths: why research most often associates the 611 to 940 nm range with collagen production and which ranges Mitochondriak® devices contain
• Clinical evidence: RCT studies on humans (Wunsch & Matuschka 2014, Couturaud 2023, Li 2021, Ngoc 2023 meta-analysis) with active links to PubMed
• Practical protocol: distance, time, frequency based on the parameters of Mitochondriak® panels and the FAQ
• Who it is for: mature skin 35+, wrinkle prevention, post-acne scars, dehydrated and tired skin

Table of contents

• What is collagen and why its production declines with age
• How red light stimulates collagen production: mechanism step by step
• Which wavelengths are most effective for collagen
• What clinical studies say about red light and collagen
• Power density (mW/cm²): why it matters more than you think
• Practical red light therapy protocol for collagen support
• Who the therapy is ideal for
• Frequently asked questions

What is collagen and why its production declines with age 

Collagen is the most abundant protein in the human body and makes up approximately 25 to 30 % of all proteins. In the skin it acts as a structural cement that keeps the dermis firm and elastic. After the age of 25, collagen production naturally declines and the skin gradually loses tension, smoothness and the ability to regenerate quickly. This decline is also influenced by glycation from sugar, oxidative stress and hormonal changes.

Type I and III collagen: how they differ

The dermis is dominated by type I collagen (about 80 to 85 %), which gives the skin its firmness. Type III collagen makes up about 10 to 15 % and is responsible for elasticity and flexibility. With aging, type I collagen drops the most, which manifests as wrinkles, sagging skin and loss of facial definition.

Fibroblasts: the cells that actually produce collagen

Fibroblasts are cells in the dermis that synthesize procollagen and gradually convert it into mature collagen fibers. If fibroblasts function efficiently, with enough energy (ATP) and the right signals, collagen production increases. If they are exhausted or damaged by oxidative stress, collagen declines. This is exactly the goal of red light therapy: to give fibroblasts energy and a signal to restart production.

Why collagen drops after the age of 30

The decline in collagen has several causes: photoaging from chronic UV exposure without preparation, glycation (binding of sugar to collagen fibers, which makes them stiff and brittle), reduced estrogen levels in women after the age of 40, lack of amino acids in the diet and chronic lack of quality light during the day.

How red light stimulates collagen production: mechanism step by step

Red and near-infrared light activates the enzyme cytochrome c oxidase (CCO) in the mitochondria of fibroblasts, which increases ATP production, releases nitric oxide (NO) and triggers gene expression for type I and III collagen. The result is a more active fibroblast, higher procollagen synthesis and gradual remodeling of the extracellular matrix in the dermis.

Step 1: The photon penetrates the dermis

A photon of red light around 630 to 760 nm penetrates approximately 1 to 3 mm into the skin and reaches the upper part of the dermis, where most active fibroblasts are located. Near-infrared light at 810 to 940 nm penetrates deeper (up to 5 mm), acts on deeper layers and also stimulates the vascular system. This depth of penetration is the reason why combined RED + NIR panels have a stronger effect than single-wavelength devices.

Step 2: Cytochrome c oxidase absorbs the photon

In the mitochondria of fibroblasts is cytochrome c oxidase, the key enzyme of the last step of the respiratory chain. CCO has absorption maxima exactly in the 620 to 680 nm and 760 to 850 nm ranges, which is why it absorbs photons of red and infrared light extremely efficiently. After absorption, the weakly bound nitric oxide (NO), which until then inhibited the enzyme, is released from CCO.

Step 3: Higher ATP and activation of collagen genes

The release of NO unblocks the respiratory chain, mitochondria increase the production of ATP and the fibroblast gains energy for protein synthesis. At the same time, signaling pathways (TGFβ, AKT) are activated and genes for type I and III collagen are expressed. You can read more about how red light therapy works in the article What is red and infrared light therapy.

Step 4: The fibroblast actively produces procollagen to collagen

With enough ATP and the right signals, the fibroblast starts producing procollagen, which is converted into mature collagen fibers outside the cell. These fibers are integrated into the extracellular matrix, which increases the density of the dermis, improves hydration and smooths fine wrinkles. You can read more about how mitochondria produce ATP in the article How mitochondria produce energy (ATP).

Which wavelengths are most effective for collagen

For collagen production, research most often associates wavelengths in the 611 to 940 nm range. Red light at 630 to 670 nm primarily stimulates surface fibroblasts, deep red 760 nm targets cytochrome c oxidase, and near-infrared 810 to 940 nm penetrates deeper and supports vascular supply. The combination of these wavelengths is the most effective, the synergistic effect has been confirmed by several clinical studies.

Red light 630 and 670 nm: surface fibroblast stimulation

The wavelengths 630 and 670 nm fall within the first absorption maximum of cytochrome c oxidase. They penetrate 1 to 3 mm into the dermis and stimulate exactly those fibroblasts that are most active for type I and III collagen. This wavelength range was also used by the Wunsch & Matuschka (2014) study, which demonstrated a significant increase in collagen density in women after red light therapy.

Deep red 760 nm: exceptional for CCO

The wavelength 760 nm is exceptional in that it targets cytochrome c oxidase directly in its second absorption maximum. Mitochondriak® is one of the few manufacturers that has included this wavelength in its infrared panels, which is why it covers the full CCO spectrum and increases the efficiency of ATP stimulation in fibroblasts.

Infrared 810, 830, 850 and 940 nm: deeper penetration

The near-infrared wavelengths 810, 830, 850 and 940 nm penetrate deeper into the tissue and, in addition to fibroblasts, also reach the capillary system in the dermis. Better microcirculation means better supply of nutrients and oxygen to fibroblasts, which increases their collagen production. NIR light also efficiently releases NO from hemoglobin and improves skin hydration.

Why a combination of multiple wavelengths is better than a single one

The Li et al. (2021) study showed that the combination of red and NIR light has a synergistic effect, increasing the production of collagen, elastin and ATP more significantly than individual wavelengths alone. [R] This is exactly why quality panels combine at least 5 to 7 different wavelengths at the same time.

The Mitochondriak® Maxi Upgraded infrared panel contains 7 wavelengths, namely 630, 670, 760, 810, 830, 850 and 940 nm, which is why it covers the entire spectrum that research links to the production of type I and III collagen. The diodes are also distributed in a 50 % red : 50 % infrared ratio to follow the spectral absorption curve of the human body.

What clinical studies say about red light and collagen

There are several randomized controlled trials (RCTs) and meta-analyses confirming that red light therapy increases collagen density, reduces wrinkles and improves skin texture. Below are the most frequently cited works with active PubMed links.

Wunsch & Matuschka (2014): RCT on 136 participants

This controlled study with 136 participants observed the effect of two light sources on the reduction of wrinkles and the increase in intradermal collagen density. The wavelengths used were 611 to 650 nm (red) and 570 to 850 nm (broader spectrum including NIR). The result: participants in the active group recorded a statistically significant improvement in skin texture and an increase in collagen density measured by ultrasound. [R]

Couturaud et al. (2023): photobiomodulation and fibroblasts

A 2023 study confirmed that photobiomodulation with red LED diodes stimulates fibroblasts and increases the production of both collagen and elastin. The authors recorded a visible reduction of wrinkles and improved skin firmness with regular sessions twice a week, with the effect lasting up to a month after the end of therapy. [R]

Li et al. (2021): combination of RED + NIR and ATP

A 2021 paper evaluated the effect of the combination of red and near-infrared LED light on the production of collagen, elastin and ATP in fibroblasts. The authors confirmed that the combination is more effective than individual wavelengths and that higher ATP production correlates with higher synthesis of structural skin proteins. [R]

Mamalis et al. (2016): visible red light and fibroblasts

A review article summarized the existing evidence on how visible red LED light affects fibroblasts and collagen synthesis. The authors confirmed the biological activity of red light at the level of individual cells and pointed out the need for larger clinical studies. [R]

Ngoc et al. (2023) meta-analysis: wrinkle reduction

A 2023 systematic review and meta-analysis summarized the results of clinical studies with LED light and confirmed a statistically significant reduction of wrinkles with high homogeneity of results across studies. [R]

Limits of current research

The other side of the coin should also be mentioned: studies differ in protocols, wavelengths, fluence and follow-up duration. Sample sizes are usually smaller (up to 200 participants) and long-term follow-up of the effect is missing. Despite this, the existing consensus clearly supports the positive effect of red light on fibroblasts and collagen.

Power density (mW/cm²): why it matters more than you think

Even the best wavelength does nothing without sufficient power density (irradiance) measured in mW/cm². Too low intensity means that photons do not reach the threshold dose needed to activate CCO. Too high a dose, on the contrary, can stress fibroblasts. This is the principle of the so-called biphasic dose response.

What is irradiance and how it is measured

Irradiance is the amount of light energy falling on 1 cm² per second. It is measured by a solarmeter or, more precisely, by a spectrometer. A solarmeter captures a broader spectrum, including ambient light, while a spectrometer measures only the targeted wavelengths. The real therapeutic value is always closer to the spectrometer reading.

Biphasic dose response: more is not always better

The principle of hormesis says that the biological effect grows with the dose only up to a certain point, after which it starts to decline. With red light therapy this means: too short an exposure does nothing, the optimal one triggers a cascade of positive reactions, and an excessive one burdens fibroblasts with oxidative stress. That is why it makes sense to follow the recommended time and distance, not to "double them for faster results".

How irradiance changes with distance

Power density decreases with distance from the panel. Example for the Mitochondriak® Maxi Upgraded infrared panel: from a distance of 30 cm, the spectrometer measures more than 110 mW/cm². Distance is therefore an equally important parameter as therapy time and the number of wavelengths.

Practical red light therapy protocol for collagen support

For collagen support we recommend 3 to 5 sessions a week lasting 10 to 20 minutes per treated area, at a distance of 45 to 60 cm from the panel. The first subtle results (better hydration, brighter skin) tend to be visible after 4 to 6 weeks, more pronounced wrinkle reduction and improved collagen density after 8 to 12 weeks of regular therapy. You can find general recommendations also in the Frequently Asked Questions section.

Distance from the panel

For treating surface body parts (skin, muscles, collagen), a distance of approximately 60 cm and a shorter time of 5 to 10 minutes are recommended. For treating deeper tissues (bones, joints, tendons, organs), a distance of 30 to 45 cm and 10 to 20 minutes are appropriate. Specific values for your panel can be found on the product page or in the FAQ section.

Session length

The optimal length of a single session for collagen support is 10 to 20 minutes per area. For full-body therapy with larger panels, the session is extended and the illuminated half of the body is alternated to cover the whole body in two parts.

Weekly frequency and expected timeline

• Week 4 to 6: subtle improvement in hydration and skin brightness
• Week 8: reduction of fine wrinkles, more even texture
• Week 12: measured increase in collagen density, visibly firmer skin

When not to use the therapy

Red light therapy is generally safe, but it should be avoided during active photosensitive treatment (some antibiotics, isotretinoin), with acute inflammatory skin conditions and around the eyes without protective goggles. With an oncological diagnosis or use of photosensitive medications, always consult your doctor.

Who red light therapy for collagen is ideal for

The greatest benefit from red light therapy is gained by people whose natural collagen production is declining or weakened, that is mature skin after the age of 35, people after acne, dehydrated skin and individuals with visible signs of photoaging.

Mature skin 35+ and wrinkle prevention

After the age of 35, collagen production decreases by 15 to 25 % compared to the twenties. Regular light therapy 3 to 5 times a week can slow this decline and, in combination with a quality diet (proteins, vitamin C, omega-3), partially compensate for it.

Post-acne scars and remodeling

For post-acne scars, collagen remodeling is key, fibroblasts need energy to rebuild scar tissue. Red and NIR light provides them with this energy and, in combination with local skincare, can significantly improve the appearance of scars.

Dehydrated and tired skin

Better microcirculation after the therapy means a higher supply of nutrients to the dermis, better hydration and visibly brighter skin already after a few sessions.

Combination with other rituals

You will achieve the best results when you combine the therapy with quality sleep, morning natural light (supporting the circadian rhythm), enough protein in your diet (collagen, eggs, bone broth) and limiting sugar to avoid glycation.

Conclusion: combining science and practice

Red light therapy is today one of the best documented tools for supporting collagen production. The mechanism is clear (CCO to ATP to fibroblast to collagen), the wavelengths are verified by studies and the protocols are precise enough to be comfortably followed at home. A quality panel with multiple wavelengths in the 630 to 940 nm range and adequate power density is an investment that pays off in visibly firmer and healthier skin.

Check out the complete range of Mitochondriak® red light therapy devices, or go directly for the proven choice, the Mitochondriak® Maxi Upgraded infrared panel, which combines 7 wavelengths, a touch display and illuminates half of the body at once. For a complete overview of the new generation, visit the red light therapy devices category.

Frequently asked questions

How long until I see the results of red light therapy on the skin?

The first subtle improvements (better hydration, brighter skin) are visible after 4 to 6 weeks of regular therapy 3 to 5 times a week. Reduction of fine wrinkles comes around week 8 and a measured increase in collagen density typically after 12 weeks. Consistency matters more than the length of an individual session.

Can I combine red light with retinol or vitamin C?

Yes, the combination is suitable and synergistic. Vitamin C is a cofactor for collagen synthesis, retinol stimulates the renewal of epidermal cells. Apply the serums after the session on clean skin so that they are better absorbed into the perfused dermis. With retinol, observe the skin's reaction and start gradually.

What is the difference between an LED mask and an infrared panel?

An LED mask usually has a lower power density (typically 5 to 30 mW/cm²) and a limited number of wavelengths. An infrared panel offers higher intensity (60 to 130+ mW/cm²) and a combination of multiple wavelengths at the same time, which allows deeper penetration and shorter sessions with a greater effect.

How many times a week should I use red light on my face?

For collagen production we recommend 3 to 5 sessions a week of 10 to 20 minutes. Daily therapy is not necessary and at higher intensity it may be counterproductive due to the biphasic dose response principle. After reaching your target state, you can switch to a maintenance regimen of 2 times a week.

Will red light help with cellulite and stretch marks too?

Collagen makes up a substantial part of the subcutaneous connective tissue as well, which is why the therapy can help with the remodeling of stretch marks and improvement of skin texture in cellulite. The effect is gradual and works best in combination with movement, hydration and a quality diet.

Sources and references 

1. Wunsch A., Matuschka K. (2014). A Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density Increase. Photomedicine and Laser Surgery. [R]
2. Couturaud V. et al. (2023). Reverse skin aging signs by red light photobiomodulation. Skin Research and Technology. [R]
3. Li W.H. et al. (2021). Low-level red plus near infrared lights combination induces expressions of collagen and elastin in human skin in vitro. [R]
4. Mamalis A. et al. (2016). Visible Red Light Emitting Diode Photobiomodulation for Skin Fibrosis. Lasers in Surgery and Medicine. [R]
5. Ngoc L.T.N. et al. (2023). Utilization of light-emitting diodes for skin therapy: Systematic review and meta-analysis. Photodermatology, Photoimmunology & Photomedicine. [R]
6. Hernández-Bule M.L. et al. (2024). Unlocking the Power of Light on the Skin: A Comprehensive Review on Photobiomodulation. [R]
7. Lee S.Y. et al. (2007). A study on the LED phototherapy for skin rejuvenation: clinical, profilometric, histologic, ultrastructural, and biochemical evaluations. [R]