A new study commissioned by the Organic Consumers Association (OCA) found that many leading "natural" and "organic" brand shampoos, body washes, and lotions contain the carcinogenic contaminant 1,4-Dioxane.

1,4-Dioxane is considered a chemical "known to the State of California to cause cancer. It is a byproduct of the cancer-causing petrochemical Ethylene Oxide, which is used as part of a short-cut process called Ethoxylation, which makes harsh ingredients milder.

1,4-Dioxane is also suspected of being a kidney toxicant, neurotoxicant and respiratory toxicant, among others, according to the California EPA. It is also a leading groundwater contaminant.

Some of the leading organic and natural brands found to contain 1,4-Dioxane include:

JASON Pure Natural & Organics
Giovanni Organic Cosmetics
Kiss My Face
Nature's Gate Organics

To avoid 1,4-dioxane, OCA recommends reading ingredient labels and avoiding products with indications of ethoxylation, which include: "myreth," "oleth," "laureth," "ceteareth," any other "eth," "PEG," "polyethylene," "polyethylene glycol," "polyoxyethylene," or "oxynol," in ingredient names.

Sources:

Organic Consumers Association March 14, 2008 (Check this link and put parabens in the search box!)