The Consumer’s
Guide to
Therapeutic Light

Red Light Therapy

Apr 15, 2026

What Is Red Light Therapy? A Clear, Science-Based Explanation

Red light therapy uses specific wavelengths of light to trigger cellular energy production. Here's the mechanism, what the research supports, and what it doesn't.

Red Light Therapy

Apr 11, 2026

Red Light Therapy Benefits: What Science Says vs. What's Hype

A breakdown of the most researched benefits of red light therapy: skin health, pain relief, hair growth, and workout recovery, with the actual evidence for each.

Infrared Therapy

Apr 27, 2026

Infrared Therapy for Inflammation: Mechanisms and Evidence

Near-infrared light reduces inflammation through specific molecular pathways. Far-infrared produces anti-inflammatory effects through heat stress. Here's what each does and where the evidence is strongest.

Infrared Therapy

Apr 26, 2026

Near-Infrared vs. Far-Infrared: Different Wavelengths, Different Mechanisms

NIR (700–1100nm) and FIR (3,000–100,000nm) are on opposite ends of the infrared spectrum. They work through completely different mechanisms. Here's why confusing them leads to the wrong device choice.

Infrared Therapy

Apr 25, 2026

Infrared Sauna Benefits: What the Research Actually Supports

Infrared saunas produce heat through far-infrared radiation rather than conventional convection. The cardiovascular and pain evidence is meaningful. Here's what's established and what isn't.

Blue Light Therapy

Apr 24, 2026

Blue Light Therapy for Seasonal Depression: How It Works and What to Expect

Bright light therapy is a first-line treatment for seasonal affective disorder backed by decades of controlled trial evidence. Here's the mechanism, the protocol that works, and what doesn't.

Blue Light Therapy

Apr 23, 2026

Blue Light Therapy for Acne: Evidence, Protocols, and Limitations

Blue light kills acne bacteria through a photochemical reaction with porphyrins. Multiple controlled trials support this mechanism. Here's what it works for, what it doesn't, and how it compares to established treatments.

Blue Light Therapy

Apr 22, 2026

What Is Blue Light Therapy? Mechanisms, Applications, and Evidence

Blue light therapy uses 415–480nm wavelengths for two distinct clinical purposes: killing acne-causing bacteria and regulating circadian rhythms and mood. Here's how each works.

Red Light Therapy

Apr 21, 2026

How Often Should You Use Red Light Therapy?

Session frequency depends on your goal and the condition you're treating. Here's what the clinical trials used, why rest days matter for some applications, and how to build a schedule that works.

Red Light Therapy

Apr 20, 2026

Red Light Therapy Dosing Guide: How to Calculate J/cm²

Dose — measured in joules per square centimeter — is the variable that determines whether red light therapy works. Here's how to calculate it, what ranges the evidence supports, and why most people underdose.

Red Light Therapy

Apr 19, 2026

Red Light Therapy at Home vs. Professional Treatment: An Honest Comparison

Clinical red light therapy devices cost $5,000–$50,000 and are used by trained practitioners. Consumer panels cost $200–$3,000. Here's what the difference actually means for results.

Red Light Therapy

Apr 18, 2026

Red Light Therapy Side Effects and Safety: What the Evidence Shows

Red light therapy has an excellent safety record across thousands of clinical trials. Here's what the actual risks are, who should avoid it, and what genuine contraindications look like.

Red Light Therapy

Apr 17, 2026

How to Use Red Light Therapy: Distance, Duration, and Protocol

Getting red light therapy right comes down to four variables: wavelength, irradiance, dose, and consistency. Here's how to set a protocol that matches the clinical evidence.

Red Light Therapy

Apr 16, 2026

Red Light Therapy for Hair Growth: FDA-Cleared and Evidence-Based

Low-level laser therapy is one of the few consumer hair loss treatments with FDA clearance and multiple controlled trials. Here's the mechanism, the evidence, and the limits.

Red Light Therapy

Apr 14, 2026

Red Light Therapy for Pain: The Evidence by Condition

Red and near-infrared light therapy reduces pain in several musculoskeletal conditions with controlled trial support. Here's what works, what doesn't, and the doses that matter.

Red Light Therapy

Apr 13, 2026

Red Light Therapy for Skin: What the Evidence Actually Shows

Red light therapy has stronger clinical evidence for skin than almost any other application. Here's what it does to collagen, wrinkles, and wound healing, and what it can't do.