University study: How much sun is too much sun?
15 August 2012 Last updated at 10:26 BST
Scientists say we need sunlight to produce vitamin D but too much tanning can put us at risk of skin cancer.
Now a new study has been set up to try and find out what effect the sun has on different skin types.
Professor Lesley Rhodes of the University of Manchester says the study will look at the risks as well as the benefits of being in the sun and will not just focus on those with pale and sensitive skin.