I’d like to use a course of treatment to generate a natural tan before an upcoming event, but the online advice is very strongly anti. How is it so much worse than natural tanning outside?
In: Biology
UVB radiation is about the same, but UVA radiation in a tanning bed can be [anywhere from 10 to 15 times stronger](https://pubmed.ncbi.nlm.nih.gov/12511047/#:~:text=Sunbed%20emission%20spectra%20are%20similar,m2%20was%20determined%20for%20sunbeds.) compared to noon on a sunny mid-summer day.
UVB is generally considered more dangerous, as it is higher-energy, penetrates deeper, and is the primary source of sunburn (and thus skin cancer). But UVA damages DNA as well, which causes skin aging and can cause cancer as well.
Neither is considered safe. The FDA recommends that you do not tan no matter what the source. If your skin is darkening, it is producing more melatonin. Skin only does that when it has been damaged, and if your skin has been damaged there is a possibility that it is causing cancer or keratoses.
Tanning doesn’t provide your skin any protection – a heavy tan is equivalent to around 5 SPF. You should be applying at least 15, probably far more.
In short, there is zero reason to tan, and lots of potential hazards, more prominently potentially-fatal cancer. Do not tan inside or out, but if you do, out is far safer.
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