There is no evidence to associate paraben exposure with breast cancer. In fact, human tissues and body fluids also contain these chemicals. However, the discovery of these chemicals in the breast tissue of breast cancer patients has raised public concerns about their use. It is suspected that the estrogenic properties of parabens may be involved in the development of breast cancer. But medical science has yet to arrive at a conclusive answer. Studies examining the health effects of these chemicals have been inconsistent.
In 2004, a small study detected trace amounts of parabens in some breast cancer tumor samples. But it is important to note that the researchers only specifically looked for their presence in breast cancer samples. It is not clear in this study whether parabens were indeed the cause of breast cancer —the study only showed that they were there. It’s still unclear what the presence of parabens means in relation to cancer.
Parabens have poor estrogen properties, but the estrogen produced by the body is hundreds or thousands of times more potent. Therefore, natural estrogens (or hormone substitutes) are much more likely to be involved in the development of breast cancer.