Red Light Therapy: What It Is and Does It Really Work?

The NBC piece explains that red light therapy, also called photobiomodulation, uses specific red wavelengths (often around 630 nm) that penetrate a few millimetres into the skin, where they are absorbed by mitochondria in cells.

This mitochondrial stimulation can increase cellular energy (ATP), support collagen production, and improve local blood circulation, which may translate into anti‑inflammatory and pro‑healing effects.​

Dermatology experts quoted in the article note that red light therapy has been used in clinical and aesthetic contexts for years, and there is encouraging evidence for certain uses such as acne management, supporting healing after procedures, and helping stimulate hair growth.

However, they emphasise that many claims—for example broader anti‑ageing or full facial rejuvenation, do not yet have enough high‑quality human studies to draw firm conclusions.​

Evidence and limitations of red light therapy

The article highlights a key nuance: red light therapy is not just social media hype, but the research base is uneven. Some specific applications have controlled trials and a plausible biological mechanism, while others rely on early or manufacturer‑funded studies that need independent replication. Experts advise treating bold marketing claims with caution, especially when studies are small, short‑term or industry‑sponsored.​

The discussion also connects red light therapy to the broader history of light‑based medicine, such as using infrared light for joint pain and other forms of light therapy for mood disorders or scar management.

This existing foundation supports optimism, but it does not automatically validate every new cosmetic or wellness claim made for red light devices.​

Safety considerations

According to the dermatologists interviewed, red light therapy is generally considered low‑risk when used as directed, particularly compared with more invasive treatments. Nonetheless, they stress a few safety points: users should follow professional guidance, avoid overuse, and understand that eye protection and appropriate dosing matter, even with non‑UV, non‑burning light.

They also underscore that individual responses vary and that realistic expectations are crucial—results, where they occur, tend to be gradual rather than dramatic.​

Conclusion and source credit

Overall, the article frames red light therapy as a scientifically interesting, cautiously promising modality: helpful for some people and indications, but not a miracle cure and not yet backed by definitive evidence for every claim seen online.

Readers are encouraged to talk with a dermatologist, especially when using red light therapy for medical skin conditions.

The full NBC article, “What is red light therapy and does it work?” by Harry Rabinowitz.