Melanoma is more common in indoor workers. That would be impossible if it were directly related to sunlight.
The people telling you to avoid tanning are also telling you to put toxic chemical sunscreen on/in your body every day. Google "oxybenzone, toxin" and see what's invading your body!
Every cell in your body has a vitamin D receptor. It's obviously VERY important!
77% of the U.S. population is vitamin D deficient. 97% of Canadians are deficient.
Indoor tanners have 90 percent higher vitamin D levels, higher bone density, and they sunburn less often.
Indoor tanning is a great substitute for what nature intended, regular sun exposure. What's not natural is rubbing toxic chemicals all over your skin every day.
People with Skin Type I are prohibited from tanning in certified tanning salons. They are unable to tan and are advised to minimize UV exposure.