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Welcome to Consultox, Limited, a toxicology consulting firm established in 1985. Dr. Richard A. Parent, Principal and Consulting Toxicologist, is a doubly Board Certified Toxicologist with a firm foundation in chemistry and over 30 years of practice in the field of Toxicology. Consultox is a full service toxicology consulting firm providing support to litigants as an Expert Witness in Toxicology and to industry as an Independent Toxicology Consultant for projects involving product safety, drug impurities, risk assessment, and various agency product registration processes.

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Expert Witness Toxicologist

Richard A. Parent, PhD, DABT, FATS, RAC, ERT, is certified by the American Board of Toxicology and the Academy of Toxicological Sciences as well as the Regulatory Affairs Certification Board. He is a recognized Expert in Toxicology in France and the European Community. Dr. Parent has over 35 years of experience in Toxicology and Chemistry and has directed two toxicology laboratories, the combination of such affords him insights that go far beyond his fields of dual expertise. Read More

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Recently, I returned from a two-week business trip in Hong Kong. During that time, I provided five days of court testimony for the defense of a shampoo product containing trace amounts of 1,4-dioxane. What qualifies me to testify on such a topic? I am a board certified consulting toxicologist and a recognized expert witness in the field of toxicology. I have over 30 years of experience as a consultant in toxicology providing expert testimony in toxicology for both plaintiff and defense. In preparation for this case, I expended over 100 hours studying the issue of 1,4-dioxane in shampoo and other consumer products. Further, I have personally used 1,4-dioxane regularly as a solvent while doing research in the field of synthetic organic chemistry for over 10 years.

I became involved in this matter because a libel suit was brought against a magazine who claimed that the use of a particular shampoo would increase the risk of cancer. 1,4-dioxane has been shown to produce cancer in animals treated at doses that are 40,000 times or more greater than the doses that man would encounter in using shampoo. Animal studies showed an increase in cancer incidences that most probably resulted from cytotoxicity followed by cell proliferation and endogenous mutations leaving the tissue subject to promotion by 1,4-dioxane or other factors. A key piece of information is that 1,4-dioxane is not genotoxic. This fact makes it clear that there is a threshold for liver cancer in animal studies which has been demonstrated repeatedly. There is also a threshold in man, and I can clearly state, as others have, that there is no risk of cancer in man as a result of using shampoo containing as much as 30 ppm, or more. Similarly, other consumer products containing 30 ppm of 1,4-dioxane are safe to use without an increased risk of cancer.


Dr. Richard A. Parent has given testimony in courts in the United States and Canada nearly 30 times, and he has been deposed over 120 in support of both plaintiff and defense. Cases cover a wide range of subjects: dramshop, diacetyl (popcorn lung), wrongful death related to methadone and carbon monoxide, personal injury involving ozone, carbon monoxide, benzene, sulfur dioxide, chlorine, 1,4-dioxane, alcohol, arsenic, and others. Dr. Parent has lectured on the requirements for the establishment of causation and the structuring of expert reports. Many redacted reports are included on this website for review. Read More


Dr. Richard Parent has assisted clients in areas of product safety relating to toys, cosmetics, household products, pesticides, OTC drugs, art supplies, and food additives (GRAS).  He has worked with appropriate agencies to meet requirements for labeling and warnings as well as creating material safety data sheets (MSDS) for various industrial products.  He has been involved in assessing risk in occupational situations where potentially hazardous substances are involved and preparing submissions in support of food additives in accordance with the GRAS procedures.  Of particular interest is Dr. Parent’s area of specialization in Inhalation Toxicology and his significant contribution to the field through the publication of his book, “Comparative Biology of the Normal Lung”, a well respected source of normal parameters related to lungs of various animal species, including man.

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