How Much Artificial Tanning Is Too Much?

Summer is quickly approaching, and everyone is doing their best to get their bodies ready to enjoy the great outdoors. Some people choose to starve themselves, some buy a gym membership and hit it hard for a few weeks. Some others, choose artificial sunlight to hide their veins by darkening their pigment, with artificial sunlight.

So, what I want to know is, how much artificial tanning is too much?