Systemic immune effects
UV exposure can influence immune activity beyond the skin through several pathways, including those independent of vitamin D.
The Science
Light can be medicine. What else could it do?
Narrowband UVB (NB-UVB) has been used for decades to treat psoriasis, eczema, and vitiligo.
But its effects may reach beyond the skin.
Studies have documented changes in circulating immune cells, inflammatory proteins, and even the gut microbiome following NB-UVB exposure.
Could these effects have therapeutic applications beyond dermatology?
That's what we're exploring.
Today, Darian Light offers NB-UVB for established dermatologic uses and considers off-label treatment (use for a purpose not reviewed or cleared by the FDA) following individual medical evaluation. Benefits outside established dermatologic uses have not been demonstrated.
What the research shows
Changes in circulating immune cells
Studies in psoriasis patients found changes in Th17 and regulatory T-cell populations following phototherapy, including NB-UVB.
Exploring autoimmune disease
A small randomized trial investigated NB-UVB in clinically isolated syndrome, an early presentation associated with multiple sclerosis. Clinical differences were not statistically significant. A subsequent analysis found changes in circulating inflammatory proteins and an MS disease activity biomarker score. These preliminary findings require confirmation.
The skin–gut connection
A small human study found changes in gut microbiome composition following NB-UVB exposure. The clinical significance remains unknown.
What we don't know. Yet.
Whether these biological changes translate into meaningful health benefits outside dermatology remains unknown. Answering that question will require rigorous clinical research.
How we’re approaching it
By working with scientific collaborators, measuring outcomes that matter to patients, and sharing what we learn, including what doesn’t work.
Curious by nature. Careful by design.