Methylene blue skincare: where the evidence stands (September 2026)
Updated 27 September 2026. A short, dated note on where the evidence for methylene blue in skincare actually stands, so there is one plain reference point as the category grows.
What is established
Methylene blue's chemistry is well understood. It is redox-active: it cycles between an oxidised and a reduced form and can act as an alternative electron carrier in the mitochondria. That behaviour, rather than any marketing claim, is why cosmetic chemists are interested in it.
The most-cited skin study remains a 2017 paper from the University of Maryland in Scientific Reports, which tested methylene blue on cultured human skin fibroblasts and a three-dimensional reconstructed skin model and reported improvements in several markers compared with other antioxidants.
What is not established
As of this note we are not aware of any large, independent, controlled human trial of topical methylene blue for skin appearance. Brand-run user surveys exist, but they measure perception, not effect against a placebo. So the honest description is "mechanistically grounded and promising", not "clinically proven".
What has changed in the market
The number of methylene blue serums has grown quickly, and many now pair it with NAD+ or its precursors. That raises a separate question about delivery: NAD+ is a large, charged molecule, and skin penetration is the open issue. We cover it in methylene blue vs NAD+ skincare.
What we'd tell a friend
- Choose a low, deliberate concentration. More is not better.
- Prefer fragrance-free, especially for sensitive skin.
- Make sure the formula also contains actives with deep evidence, such as niacinamide.
- Keep SPF as your non-negotiable, and a retinoid if wrinkles are the main concern.
We'll add a new note here whenever meaningful new research or UK regulatory news appears. For the full picture, start with does methylene blue skincare work?
Reference: Xiong Z-M et al., "Anti-Aging Potentials of Methylene Blue for Human Skin Longevity", Scientific Reports 7, 2475 (2017). General information only, not medical advice.