Sun exposure promotes the proliferation of certain skin microbiome bacteria (notably Sphingomonas and Erythrobacteraceae) that strengthen protection against UV rays and reduce oxidative stress.

noli's read

This claim is based on emerging research studying the interaction between the skin microbiome and the environment. A study published in *Frontiers in Microbiology* did observe that UV exposure can alter the skin's bacterial composition, including genera like Sphingomonas, which possess potential photoprotection mechanisms. However, it is important to note that this evidence comes primarily from observational or preliminary experimental studies, not large-scale human clinical trials. While the idea that our microbiome contributes to our skin defenses is scientifically appealing and supported by current research on the skin-microbiota axis, the extrapolation that this would be sufficient to replace conventional sun protection would be an exaggeration. The exact mechanisms by which these bacteria reduce reactive oxygen species are still being explored. In short, the creator points to a fascinating biological reality that is still at the stage of fundamental discovery.

the sources

No named source held this one up — that absence is part of the verdict.