There seem to be so little reliable information about it. Been googling quite a few times, but I find nothing really interesting.
On the dark side i find:
1) Increases heavilly chances of skin cancer.
2) It WILL accelerate your skin aging.
But they all end with ".. but you can buy our sunless tan product and..." who obviously have motives for getting you away from the sun and tanning salons. Or they come from government organizations like this one:
But I've lost faith in governmental organization. They ban stuff without any proof, and historically done big mistakes before (can you say, no-fat?). I sometimes think they just make claims now and then so people think they work for their salary.
On the good side, we have:
1) Vitamin E (Which I believe can be reached from other sources).
2) A cool tan, and all the babes who come with it
3) Increased testosterone (questionable)
4) Increases level of well being. Since I live close to the polar circle, winter time we have few hours of daylight, which often brings depresions. But a visit at a tanning bed each week and it all goes away.
I guess you can get the tan with a tan spray, which I've been experimenting with lately, but it doesn't give the same mood effects. Allso it disappears after a few days, after never been really great.
Since the dawn of the day we stepped out of the water we've been heavilly exposed for sunlight. And even the pale northern people had ancestors not that far away (I think) living in areas with heavy light and heat exposure. So by nature, we were never meant to living in darkness like the FDA wants us to. But the data of increased skin cancer are scary. And I've seen plenty of people with a tan that looked much older than they were for their age. Allso compare 10 random 40 year old scandinavians with 10 random 40 year olds mediterreanean, and you'll see a marked difference in skin.
So anyway with all that in mind, and in case you've read something from some other seemingly unmotivated source...
1) What is that source?
2) Is UVA rays (especially from tanning salons) harmfull at all in moderations (1-2 times pr week)?
3) What is better: Tan 2 hours in strong sunlight with sunfactor 12 or 2 hour in moderate (half strength) sunlight with sunfactor 6?
4) Is it really better to tan for long hours, with a big sunfactor, in weaker sunlight, then a 2 hour heavy set almost to failure (sunburn).
5) Does suncream give the same protection in the entire UV spectre?
Hmm yes, that's just about all.