Everyone aware, skin is the largest living organ of your body and many cancer-causing chemicals can be absorbed through
it into the  bloodstream. Research at University of Pittsburg shows that twice as much toxic chemicals can enter our body
through the skin as through the intestine. Cosmestic ingredients, especially are most certainly absorbed through the skin.
According to a study quoted in The Safe Shopper’s Bible, 13% of the cosmetic preservative, butylated hydroxytoluene
(BHT) and 49% of the carcinogenic pesticide DDT (which is found in some cosmetics containing lanolin, according to a 1988
US survey) is absorbed through the skin. Some chemicals may penetrate the skin in significant amounts, especially
when left on the skin for long periods, as in the case of facial makeup. In the case of nitrosamines (which frequently
containminate cosmetics), they are absobed into the skin in far greater amounts than when  nitrite-preserved foods
(such as bacon) are eaten.
Dr David H. Fine, the chemist who uncovered nitrosamines in the cosmetics, estimates that a person would be applying
50 – 100 micrograms (mcg) of nitrosamine to the skin each time he or she uses a notrosamine-contaminated cosmetic.
By comparison, a person consuming sodium-nitrite-preserved bacon is exposed to less than 1 mcg of nitrosamine.
Because many of these products are also used by children and young adults, the potential for long-term exposure can be
considerable. Some chemicals like saccharin and fluoride in the toothpaste and alcohol in mouthwash can also be ingested during use. For example, in 1997 survey done with help of toothpaste manufacturers and the
American Dental Association found that you can ingest nearly half your daily allowance of fluoride (ie 1 gram) each time you brush your teeth.