This is a question for Dr. Baumann --- I've been reading that most cosmetics (except 6 companies) are probably using nanosunscreens in their products. Friends of the Earth website www.foe.org has a fairly comprehensive booklet that you can download - they say that these nanosunscreens are potentially very dangerous and can migrate to internal organs and do damage at the cellular level. According to FOE most of the companies won't confirm whether or not they are using such producsts. The three main product lins I use are Aveeno, Neutrogena and Prescriptives. Dr. Baumann should we be concerned about nanosunscreens?