The harmfulness of UVs has already been demonstrated, particularly for the skin. On the other hand, the UV lamps marketed in supermarketswithout contraindications, seem safe, despite including UV radiation between 340 and 395 nm and few studies on the subject (source 1).
“But to our knowledge, no one has really studied these devices and how they affect human cells at the molecular and cellular levels so far,” said Ludmil Alexandrov, professor of bioengineering and cellular and molecular medicine at the UC San Diego and corresponding author of the study.
According to the study published in the journal Nature (source 2), UV lamps to cure the varnish would damage and kill up to 20 to 30% of the cells for an exposure of only 20 minutes. This study therefore relates to in vitro irradiation of three different cell lines: adult human skin keratinocytes, human foreskin fibroblasts and mouse embryonic fibroblasts, in order to evaluate DNA damage and the mutagenic effects of UV radiation. Each type of skin was irradiated several times for a duration of 0 to 20 minutes. Cell viability was measured 2 days following the final irradiation,…
