These can really be anything. Read ALL labels very carefully. This includes but is NOT limited to food products, prescriptions, laundry soap, fabric softener, toothpaste, shampoo, soap and anything that could potentially come in contact with your body (either by eating, drinking, smelling or in some manner being absorbed by or into your skin). Your skin is your largest organ and cannot be discounted when discussing chemicals or medications entering your system. Please be cautious of cleaning products in the shower and your home. Your feet will absorb everything you use to clean the shower. There are many companies that make SAFER options. It is estimated that infant babies are exposed to approximately half-a-dozen personal care products from birth. Never mind most of them contact the skin directly and contain ingredients that are known to be toxic and should NOT be used. This includes things like baby powder which contains talc. Talc has been shown repeatedly to cause long-term health problems and should be avoided. Dr. Skip, O.M.D., has spent the better part of his career studying the dangers of such products.