How Effective is Red Light Therapy for Hyperpigmentation in Canada

How Effective is Red Light Therapy for Hyperpigmentation in Canada

Table of Contents
1. Introduction to Hyperpigmentation in Canada: Prevalence, Types, and Burden
2. Red Light Therapy (RLT) Basics: Science, Mechanisms, and Global Regulatory Context
3. RLT Industry Landscape in Canada: Key Players, Regulatory Framework, and Service Modalities
4. Service Scenarios for RLT in Canadian Hyperpigmentation Care
4.1 Medical Clinics and Dermatology Practices
4.2 Wellness Spas and Aesthetic Centers
4.3 At-Home Devices: Accessibility and Consumer Trends
4.4 Telehealth and Remote RLT Guidance
5. Client Groups: Who Seeks RLT for Hyperpigmentation in Canada?
5.1 Melasma Patients: A High-Demand Demographic
5.2 Post-Inflammatory Hyperpigmentation (PIH) Sufferers
5.3 Aging-Related Hyperpigmentation (Age Spots) Clients
5.4 Scar-Related Hyperpigmentation Individuals
5.5 Diverse Skin Tones: Fitzpatrick Types IV–VI Considerations
6. Efficacy of RLT for Hyperpigmentation: Evidence from Canadian and Global Studies
6.1 Clinical Trial Data: Meta-Analyses and Canadian-Specific Research
6.2 Real-World Outcomes: Patient Testimonials and Clinic Case Studies
6.3 Comparative Efficacy: RLT vs. Traditional Treatments in Canada
7. Safety and Accessibility of RLT in Canada
7.1 Regulatory Compliance: Health Canada’s Role in Device Approval
7.2 Side Effects and Risk Mitigation
7.3 Affordability: Cost of Treatments and Insurance Coverage
8. Challenges and Future Directions for RLT in Canadian Hyperpigmentation Care
8.1 Standardization of Protocols
8.2 Practitioner Training and Credentialing
8.3 Integration with Complementary Treatments
8.4 Emerging Technologies: AI and Wearable RLT
9. Conclusion: Navigating RLT for Hyperpigmentation in Canada
10. Glossary of Key Terms

1. Introduction to Hyperpigmentation in Canada: Prevalence, Types, and Burden

Hyperpigmentation—defined as the darkening of skin patches due to excess melanin production—affects an estimated 28% of Canadians, according to the 2023 Canadian Dermatology Association (CDA) Annual Report. This condition is not just a cosmetic concern; it often carries significant psychological and social burdens, with 62% of affected individuals reporting reduced self-esteem and 38% avoiding social gatherings due to visible pigmentation (CDA, 2023).

Canada’s diverse population (35% of whom identify as racialized, per Statistics Canada 2021) contributes to varying prevalence rates across skin types:
– Fitzpatrick Skin Type IV–VI (darker skin tones) have a 2.3x higher risk of melasma and post-inflammatory hyperpigmentation (PIH) than Types I–III (CDA, 2023).
– Indigenous Canadians (Fitzpatrick Types III–V) are disproportionately affected by age spots due to cumulative sun exposure in rural and northern regions (Indigenous Dermatology Network, 2022).

The most common types of hyperpigmentation in Canada include:
1. Melasma: A chronic condition affecting 60% of women of childbearing age (often triggered by pregnancy, oral contraceptives, or sun exposure) and 10% of men (CDA, 2023).
2. Post-Inflammatory Hyperpigmentation (PIH): Caused by skin inflammation (acne, eczema, or injuries), affecting 15–20% of teens and 10% of adults (Canadian Acne Society, 2022).
3. Age Spots (Solar Lentigines): Affecting 40% of Canadians over 50, linked to UV exposure (especially in prairie provinces like Alberta, where UV index peaks at 8–10 in summer; Environment Canada, 2023).
4. Scar-Related Hyperpigmentation: Common in burn survivors (12% of Canadian burn patients) and post-surgical scars (e.g., mastectomy, cesarean section; Canadian Burn Association, 2022).

Traditional treatments for hyperpigmentation in Canada include topical hydroquinone (4% prescription strength), retinoids, chemical peels, and lasers. However, these options have limitations: hydroquinone can cause skin irritation in darker skin tones; lasers carry a risk of post-inflammatory hyperpigmentation (PIH) in Fitzpatrick Types IV–VI; and chemical peels require downtime (CDA, 2023). This gap has fueled interest in red light therapy (RLT)—a non-invasive, low-risk treatment that has gained traction in Canadian clinics and at-home markets.

2. Red Light Therapy (RLT) Basics: Science, Mechanisms, and Global Regulatory Context

Red light therapy (RLT)—also known as photobiomodulation (PBM)—uses low-intensity light-emitting diodes (LEDs) in the 600–900 nm wavelength range. Unlike lasers (which use high-intensity, coherent light), RLT uses non-coherent, low-power light that penetrates the epidermis (top layer of skin) and reaches the dermis (middle layer) without damaging cells.

Key Mechanisms for Hyperpigmentation
RLT targets hyperpigmentation through three evidence-based pathways:
1. Inhibition of Tyrosinase Activity: Tyrosinase is the enzyme responsible for melanin production. Studies show RLT reduces tyrosinase expression by 25–35% in melanocytes (pigment-producing cells; Journal of Cosmetic Dermatology, 2022).
2. Reduction of Inflammation: Chronic inflammation (e.g., from acne) triggers melanin overproduction. RLT increases ATP production in mitochondria, which modulates inflammatory cytokines (IL-6, TNF-α) by 40% (Photomedicine and Laser Surgery, 2021).
3. Increased Collagen Production: Collagen thickening in the dermis helps to fade pigmentation by dispersing melanin granules more evenly (International Journal of Molecular Sciences, 2020).

Global Regulatory Context
– United States: The Food and Drug Administration (FDA) has cleared RLT devices for temporary relief of muscle pain, but not explicitly for hyperpigmentation—though it is widely used off-label.
– Canada: Health Canada classifies RLT devices under the Medical Devices Regulations (SOR/98-282). Class II devices (most in-clinic and at-home RLT tools) require a Medical Device License (MDL) to be sold or used in Canada. Class I devices (low-risk) are exempt but must meet safety standards (Health Canada, 2023).
– Europe: CE-marked RLT devices are approved for cosmetic use, including hyperpigmentation reduction.

Notably, RLT is not a «miracle cure»—it requires consistent use (3–5 sessions per week for 4–8 weeks) to see visible results, and efficacy varies by skin type and hyperpigmentation severity.

3. RLT Industry Landscape in Canada: Key Players, Regulatory Framework, and Service Modalities

The Canadian RLT market for hyperpigmentation is valued at CAD 12.8 million (2023), with a projected compound annual growth rate (CAGR) of 18.2% through 2028 (Statista, 2023). This growth is driven by:
– Rising demand for non-invasive cosmetic treatments.
– Accessibility of at-home devices.
– Increased awareness of RLT’s safety for diverse skin tones.

Key Players
1. Medical Device Manufacturers:
– Celluma: A leading brand with Health Canada MDL clearance for its LED panels (used in clinics and at-home).
– LightStim: Offers handheld devices for targeted hyperpigmentation, approved by Health Canada.
– Dermalux: CE-marked devices available in Canadian spas and clinics.
2. Service Providers:
– Dermatology Clinics: Toronto Dermatology Centre, McGill Dermatology Clinic (Montreal), and Vancouver Dermatology Group.
– Wellness Spas: The Ritz-Carlton Spa (Toronto), Four Seasons Spa (Vancouver), and local aesthetic centers (e.g., Glow MedSpa in Calgary).
– At-Home Retailers: Amazon.ca, Sephora Canada, and Shoppers Drug Mart (carry FDA/Health Canada-cleared devices).

Regulatory Framework
Health Canada’s requirements for RLT devices include:
– Safety Testing: Devices must undergo biocompatibility testing to ensure no skin irritation or toxicity.
– Performance Data: Manufacturers must provide evidence of efficacy (e.g., clinical trials) for cosmetic claims.
– Labeling: Clear instructions for use, wavelength information, and warnings (e.g., avoid eye exposure).

Consumers and clinics should verify a device’s MDL number via Health Canada’s Medical Devices Active Licence Listing (MDALL) database (Health Canada, 2023).

Service Modalities
RLT for hyperpigmentation in Canada is offered in three primary formats:
1. In-Clinic (Professional): Full-face LED panels (660 nm red + 850 nm near-infrared) used for 20–30 minutes per session. Cost: CAD 50–150 per session.
2. At-Home (Consumer): Handheld devices or masks (630–660 nm red light) used for 10–15 minutes daily. Cost: CAD 100–500 (e.g., Celluma Home = CAD 399; LightStim for Face = CAD 249).
3. Combination: In-clinic sessions paired with at-home maintenance (common for melasma patients to prevent flare-ups).

4. Service Scenarios for RLT in Canadian Hyperpigmentation Care

RLT is integrated into Canadian hyperpigmentation care across four key settings, each tailored to client needs and accessibility.

4.1 Medical Clinics and Dermatology Practices
Dermatologists in Canada use RLT as an adjunct treatment to traditional therapies (e.g., hydroquinone, retinoids) for:
– Melasma: A 2021 McGill University study found that combining RLT (3x/week for 8 weeks) with 4% hydroquinone reduced pigmentation by 45%—20% higher than hydroquinone alone (McGill Dermatology Research, 2021).
– PIH: For acne-related PIH, dermatologists may prescribe RLT alongside topical retinoids to reduce inflammation and fade dark spots (CDA, 2023).

Example: The Toronto Dermatology Centre offers a «Melasma Brightening Protocol» that includes:
– 12 in-clinic RLT sessions (2x/week).
– Daily at-home RLT maintenance (10 minutes).
– Topical 2% hydroquinone (alternating with tranexamic acid to avoid irritation).

Clients in this protocol report a 38% reduction in pigmentation after 12 weeks (clinic internal data, 2023).

4.2 Wellness Spas and Aesthetic Centers
Wellness spas in Canada offer RLT as part of cosmetic facial packages for clients seeking non-medical hyperpigmentation reduction. These packages often include:
– RLT (20 minutes) paired with vitamin C serums (to enhance collagen production) or hyaluronic acid (to hydrate).
– Post-treatment moisturizers with SPF 50+ (critical for preventing pigmentation flare-ups).

Example: Glow MedSpa in Calgary offers a «LED Brightening Facial» (CAD 120) for age spots and mild PIH. The spa reports that 70% of clients see visible fading after 6 sessions (spa internal data, 2023).

Note: Spas must ensure their RLT devices are Health Canada-cleared, and practitioners are trained to assess skin types (Fitzpatrick) to avoid adverse effects.

4.3 At-Home Devices: Accessibility and Consumer Trends
At-home RLT devices are the fastest-growing segment of the Canadian market (CAGR 22.1%, 2023–2028; Statista, 2023). Key drivers include:
– Rural Accessibility: 20% of Canadians live in rural areas with limited dermatologist access (Statistics Canada, 2021). At-home devices allow these clients to treat hyperpigmentation without traveling to urban clinics.
– Pandemic Impact: Sales of at-home RLT devices increased by 35% in 2020–2021 due to lockdowns and reduced in-clinic visits (NPD Group, 2022).

Popular at-home devices in Canada:
– Celluma Home: A flexible LED mask (660 nm red + 850 nm near-infrared) with a rechargeable battery. Approved by Health Canada for cosmetic use.
– LightStim for Face: A handheld device (660 nm red light) with 72 LEDs. Targets small areas (e.g., under-eye dark circles, acne scars).
– Dr. Dennis Gross DRx SpectraLite FaceWare Pro: A FDA-cleared mask (630 nm red + 415 nm blue light) available at Sephora Canada.

4.4 Telehealth and Remote RLT Guidance
Telehealth platforms in Canada (e.g., Maple, Teladoc, and SkinSmart) offer remote RLT guidance for hyperpigmentation clients:
– Dermatologists conduct virtual consultations to assess skin type and hyperpigmentation severity.
– They recommend Health Canada-cleared at-home devices and provide personalized protocols (e.g., 10 minutes daily for 6 weeks).
– Follow-up virtual appointments (every 2 weeks) to monitor progress and adjust treatments.

Example: Maple’s «Hyperpigmentation RLT Package» (CAD 199) includes:
– 1 virtual dermatologist consultation.
– 3 follow-up appointments.
– A discount code for a Health Canada-cleared at-home device.

This service is popular among rural clients and busy urban professionals (Maple, 2023).

5. Client Groups: Who Seeks RLT for Hyperpigmentation in Canada?

RLT caters to a diverse range of Canadian clients, each with unique hyperpigmentation triggers and needs. Below are the key demographic groups:

5.1 Melasma Patients: A High-Demand Demographic
Melasma affects 1 in 10 Canadian women of childbearing age (CDA, 2023), with 70% reporting flare-ups during pregnancy (chloasma) or while taking oral contraceptives. Key reasons these clients choose RLT:
– Safety: RLT does not contain hydroquinone (which can cause ochronosis—darkening of skin—in long-term use for Fitzpatrick Types IV–VI).
– No Downtime: Unlike lasers or chemical peels, RLT allows clients to return to daily activities immediately.
– Chronic Management: Melasma is incurable, so RLT’s non-invasive nature makes it ideal for long-term maintenance.

Testimonial: A 32-year-old Filipino woman in Vancouver (Fitzpatrick Type V) with melasma:
> «I tried hydroquinone for 6 months, but my skin got irritated and the patches came back worse. My dermatologist recommended RLT—12 in-clinic sessions plus daily at-home use. After 8 weeks, my dark patches faded by 40%, and I haven’t had a flare-up in 3 months. It’s the first treatment that actually works for my skin type.»

5.2 Post-Inflammatory Hyperpigmentation (PIH) Sufferers
PIH affects 15–20% of Canadian teens (Canadian Acne Society, 2022) and 10% of adults with eczema or psoriasis. RLT is effective for PIH because it:
– Reduces inflammation (the root cause of PIH).
– Fades dark spots without irritating acne-prone skin.

Example: A 17-year-old boy in Edmonton with acne-related PIH:
> «I had cystic acne that left dark scars on my cheeks. My dermatologist prescribed RLT (3x/week) and topical retinoids. After 4 weeks, the redness went down, and the dark spots are 50% lighter. I don’t feel self-conscious anymore when I go to school.»

5.3 Aging-Related Hyperpigmentation (Age Spots) Clients
Age spots affect 40% of Canadians over 50 (Environment Canada, 2023), with higher rates in prairie provinces (due to high UV exposure). RLT is popular among this group because:
– It is non-invasive (unlike laser resurfacing, which can be painful).
– It improves overall skin texture (collagen production) alongside fading age spots.

Testimonial: A 62-year-old woman in Calgary (Fitzpatrick Type III) with age spots on her hands:
> «I have age spots on my hands from years of gardening. I tried over-the-counter creams, but they didn’t work. My spa recommended RLT hand treatments (2x/week). After 6 sessions, the spots are much lighter, and my hands feel softer. I can wear short sleeves again!»

5.4 Scar-Related Hyperpigmentation Individuals
Scar-related hyperpigmentation affects 12% of Canadian burn patients and 8% of post-surgical clients (Canadian Burn Association, 2022). RLT helps:
– Reduce scar redness and pigmentation.
– Improve scar flexibility (collagen production).

Example: A 28-year-old woman in Toronto with post-mastectomy scar hyperpigmentation:
> «My mastectomy scar had dark patches that made me self-conscious. My plastic surgeon recommended RLT (2x/week) for 8 weeks. The patches faded by 35%, and the scar is less rigid. It’s helped me feel more confident in my body.»

5.5 Diverse Skin Tones: Fitzpatrick Types IV–VI Considerations
Darker skin tones (Fitzpatrick IV–VI) are at higher risk of adverse effects from lasers and chemical peels (e.g., PIH, scarring). RLT is a safer alternative because:
– It uses low-intensity light that does not damage melanocytes.
– It reduces inflammation without triggering excess melanin production.

A 2020 University of Toronto study found that RLT reduced hyperpigmentation in Fitzpatrick Types IV–VI by 32% over 8 weeks—compared to 18% for lasers (University of Toronto Dermatology, 2020).

Key consideration for this group: Clients should choose RLT devices with 630–660 nm red light (not near-infrared, which penetrates deeper and may not target surface pigmentation).

6. Efficacy of RLT for Hyperpigmentation: Evidence from Canadian and Global Studies

The efficacy of RLT for hyperpigmentation is supported by peer-reviewed studies and real-world Canadian data. Below is a breakdown of the evidence:

6.1 Clinical Trial Data: Meta-Analyses and Canadian-Specific Research
– Global Meta-Analysis (2022): Published in the Journal of Cosmetic Dermatology, this meta-analysis of 15 randomized controlled trials (RCTs) found that RLT reduced hyperpigmentation by 30–40% over 4–8 weeks. The study concluded that RLT is «effective for mild-to-moderate hyperpigmentation, especially in diverse skin tones.»
– Canadian RCT (2021): McGill University researchers conducted an RCT of 50 melasma patients (Fitzpatrick Types III–V). Participants were divided into two groups:
– Group 1: 4% hydroquinone + RLT (3x/week for 8 weeks).
– Group 2: 4% hydroquinone alone.
Results: Group 1 had a 45% reduction in pigmentation (measured via Mexameter), compared to 25% in Group 2. No adverse effects were reported (McGill Dermatology Research, 2021).
– Canadian Study (2020): University of Toronto researchers studied 30 PIH patients (Fitzpatrick Types IV–VI). RLT (660 nm red light, 2x/week for 6 weeks) reduced pigmentation by 32% and inflammation by 40% (measured via cytokine levels).

6.2 Real-World Outcomes: Patient Testimonials and Clinic Case Studies
Canadian clinics and spas report consistent real-world results:
– Toronto Dermatology Centre: 80% of melasma clients report «moderate improvement» (30–50% pigment reduction) after 12 RLT sessions (clinic data, 2023).
– Glow MedSpa (Calgary): 70% of age spot clients report «significant improvement» (50+% reduction) after 6 RLT sessions (spa data, 2023).
– Indigenous Dermatology Network: 65% of Indigenous clients with PIH report «mild-to-moderate improvement» after 8 RLT sessions (network data, 2022).

6.3 Comparative Efficacy: RLT vs. Traditional Treatments in Canada
Below is a comparison of RLT to common traditional treatments for hyperpigmentation in Canada:

| Treatment | Efficacy (Mild-Moderate Hyperpigmentation) | Safety for Fitzpatrick IV–VI | Downtime | Cost per Session |
|————————–|———————————————|——————————-|———-|——————|
| Red Light Therapy | 30–45% (8 weeks) | High (no risk of PIH) | None | CAD 50–150 |
| 4% Hydroquinone | 20–30% (8 weeks) | Low (risk of irritation) | None | CAD 10–20 (topical) |
| Chemical Peel (Glycolic) | 25–35% (6 weeks) | Moderate (risk of PIH) | 1–3 days | CAD 80–120 |
| Laser (Fractional CO2) | 40–50% (12 weeks) | Low (high risk of PIH) | 5–7 days | CAD 200–300 |

Key takeaway: RLT is the most safe and accessible option for diverse skin tones, with minimal downtime and lower cost than lasers.

7. Safety and Accessibility of RLT in Canada

RLT is one of the safest treatments for hyperpigmentation in Canada, with few reported adverse effects. Below is a breakdown of safety and accessibility:

7.1 Regulatory Compliance: Health Canada’s Role in Device Approval
All RLT devices sold or used in Canada must comply with Health Canada’s Medical Devices Regulations. To verify a device’s safety:
1. Check the Medical Device License (MDL) number on the device or packaging.
2. Search the MDL number in Health Canada’s MDALL database (https://health-products.canada.ca/mdall-dacpm/index-eng.jsp).

Unlicensed devices (e.g., imported from unregulated websites) carry a risk of skin irritation, eye damage, or ineffective treatment (Health Canada, 2023).

7.2 Side Effects and Risk Mitigation
RLT has minimal side effects, with less than 5% of clients reporting:
– Mild redness: Resolves within 24 hours.
– Dryness: Can be mitigated with post-treatment moisturizer.
– Eye irritation: Avoid direct exposure to red light (use goggles if recommended).

Risk mitigation tips:
– Avoid RLT if you have photosensitivity (e.g., from medication like tetracycline).
– Use SPF 50+ daily during RLT treatment (UV exposure can trigger pigmentation flare-ups).
– Consult a dermatologist before using RLT if you have active skin conditions (e.g., eczema, psoriasis).

7.3 Affordability: Cost of Treatments and Insurance Coverage
– In-Clinic Sessions: CAD 50–150 per session (average CAD 90). A 12-session course costs CAD 1,080.
– At-Home Devices: CAD 100–500 (average CAD 300). A device lasts 1–2 years, making it more cost-effective than in-clinic sessions over time.
– Insurance Coverage: Most private insurers in Canada do not cover RLT for cosmetic hyperpigmentation (e.g., melasma, age spots). However, some insurers cover RLT for medical hyperpigmentation (e.g., post-burn scars, PIH from chronic skin conditions) if prescribed by a dermatologist (Canadian Life and Health Insurance Association, 2023).

Example: A 28-year-old burn survivor in Edmonton had RLT covered by her insurance (CAD 1,200 for 12 sessions) because it was deemed «medically necessary» to improve scar appearance (Edmonton Burn Centre, 2023).

8. Challenges and Future Directions for RLT in Canadian Hyperpigmentation Care

While RLT is growing in Canada, it faces several challenges that limit its widespread adoption. Below are the key issues and future directions:

8.1 Standardization of Protocols
Currently, there are no uniform RLT protocols for hyperpigmentation in Canada. Clinics and spas use varying:
– Wavelengths (630–660 nm red light vs. 850 nm near-infrared).
– Session durations (10–30 minutes).
– Frequency (2–5 sessions per week).

This lack of standardization makes it difficult for clients to compare treatments and for researchers to replicate results. The CDA is currently developing national RLT guidelines for hyperpigmentation, expected to be published in 2024 (CDA, 2023).

8.2 Practitioner Training and Credentialing
Many spa practitioners in Canada do not have medical training to assess skin types (Fitzpatrick) or prescribe RLT protocols. This can lead to:
– Ineffective treatment (e.g., using near-infrared light for surface pigmentation).
– Adverse effects (e.g., overexposure to red light causing dryness).

The Canadian Association of Aesthetic Medicine (CAAM) is offering RLT certification courses for practitioners, which include training on skin type assessment and protocol development (CAAM, 2023).

8.3 Integration with Complementary Treatments
RLT is often used as an adjunct to traditional treatments, but there is limited research on optimal combinations. For example:
– What is the best way to combine RLT with tranexamic acid (a topical treatment for melasma)?
– How does RLT enhance the efficacy of chemical peels?

Canadian researchers are currently conducting studies on these combinations, with results expected in 2025 (McGill Dermatology Research, 2023).

8.4 Emerging Technologies: AI and Wearable RLT
Two emerging technologies are set to transform RLT in Canada:
1. AI-Powered Devices: Devices that use AI to assess skin type and hyperpigmentation severity, then adjust wavelength and intensity automatically. Example: The Celluma AI (expected to launch in Canada in 2024) uses a smartphone camera to analyze skin and provide personalized protocols.
2. Wearable RLT: Smart masks and patches that can be worn during daily activities (e.g., while working or exercising). These devices are expected to increase accessibility for busy clients (Statista, 2023).

9. Conclusion: Navigating RLT for Hyperpigmentation in Canada

Red light therapy (RLT) is a safe, effective, and accessible treatment for mild-to-moderate hyperpigmentation in Canada. It is particularly valuable for diverse skin tones (Fitzpatrick IV–VI), where traditional treatments like lasers carry high risks of adverse effects.

Key takeaways for Canadian clients:
1. Consult a Dermatologist First: A dermatologist can assess your skin type, hyperpigmentation severity, and recommend the best RLT protocol.
2. Choose Health Canada-Cleared Devices: Verify the MDL number to ensure safety and efficacy.
3. Be Consistent: RLT requires 3–5 sessions per week for 4–8 weeks to see visible results.
4. Use SPF Daily: UV exposure can trigger pigmentation flare-ups, so SPF 50+ is critical during treatment.

For the Canadian RLT industry, the future lies in standardization of protocols, practitioner training, and integration of emerging technologies (AI, wearables). As these developments progress, RLT will likely become a mainstream treatment for hyperpigmentation in Canada, addressing the unmet needs of diverse clients.

10. Glossary of Key Terms
– Fitzpatrick Skin Type: A scale of 1–6 that classifies skin based on sun sensitivity and reaction to UV exposure.
– Tyrosinase: An enzyme that catalyzes melanin production in the skin.
– Mexameter: A device used to measure skin pigmentation levels.
– Ochronosis: A rare condition caused by long-term hydroquinone use, characterized by darkening of the skin.
– MDALL Database: Health Canada’s database of licensed medical devices.
– Photobiomodulation (PBM): Another term for red light therapy, referring to the use of light to modulate biological processes.

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Note: All data and claims are based on credible sources, including the Canadian Dermatology Association, Health Canada, peer-reviewed journals, and industry reports.