What is the difference between keratin and melanin? and what impacts do the sun have on our skin if there is less of

What is the difference between keratin and melanin? and what impacts do the sun have on our skin if there is less of one or the other?

Posted on March 12, 2013 by in Question. Comments Off on What is the difference between keratin and melanin? and what impacts do the sun have on our skin if there is less of