The Growing Concern of Parabens
A recent study linked parabens with breast cancer: "Concentration of Parabens in Human Breast Tumors." Darbre, PD. et al. J. Appl. Toxicol. 24, 5-13 (2004).
Parabens have been used as preservatives since the 1920s. They are used to prevent the growth of bacteria. By far the most prevalent use has been in cosmetics, skin care products, shampoos, conditioners, sunscreens, deodorants, and soaps. A report that was published in 1984 - Elder, RL. "Final report on the safety assessment of methylparaben, ethylparaben, propylparaben and butylparaben." Journal of the American College of Toxicology, vol. 3, pp. 147-209, 1984 - estimated that parabens were used in over 13,200 different cosmetic products.
Recent evidence from over a dozen scientific studies has indicated that several types of parabens can bind to the estrogen receptor and cause estrogen-like responses when tested in laboratory animals or in a variety of tissue cultures. In studies using animals, the estrogenic effects were not found when fed, only when applied to or injected into the skin. There is no comprehensive research regarding the long-term effects of low-dose paraben use.
In these studies, the researchers looked at twenty (20) human breast tumours and found synthetic chemicals known as parabens in eighteen (18) of them. The level of parabens in four of the tumours so high that it could have had a damaging biological effect on cells. It is the first time parabens (para-hydroxybenzoic acids) have been detected within tumours, suggesting that the man-made chemicals accumulated in the breast tissue after being absorbed through the skin.
According to The Campaign for Safe Cosmetics, "the chemicals in any one consumer product alone are unlikely to cause harm. But unfortunately, we are repeatedly exposed to industrial chemicals from many different sources on a daily basis, including cosmetics and personal care products."