Unpacking the Fallacy of "Intrinsic" Chemical Hazards

Atanu joins Rob Mitkus, a PhD toxicologist with 25 years’ experience across pesticides, industrial chemicals, vaccine components, medical devices, and consumer products, to discuss how toxicology underpins Safety Data Sheets (SDS) and HazCom/GHS compliance. Rob defines toxicity as harm under specific conditions and emphasizes SDS content and precautions should be evidence-driven and understandable to downstream users including workers, consumers, and first responders. They discuss reliance on animal “sentinel species,” the rise of new approach methodologies (in vitro, in silico, machine learning), and validation/acceptance via bodies such as OECD and ICCVAM, noting limits for complex endpoints like carcinogenicity and reproductive toxicity. Rob critiques GHS concepts like “intrinsic toxicity,” the definition of sensitization, and hazard-only/binary classifications, stressing dose-response and exposure. He highlights the psychology of threat perception from pictograms and calls for better training and toxicologist involvement in future standards. 00:00 Meet the Toxicologist 01:28 What Toxicity Means 02:44 Toxicology in SDS 04:23 Who Uses SDS 07:09 Why Animal Data Matters 10:23 Choosing Sentinel Species 12:12 New Approach Methods 14:02 Validating NAMs Worldwide 19:18 EPA Skin Sensitization Case 21:10 AI Promise and Pitfalls 24:59 Do SDSs Communicate Well 30:24 Marketing Pushback on Hazards 33:00 Consumer Labels and Overload 34:20 Reading Labels Beyond Icons 36:08 GHS Strengths and Limits 37:53 Myth of Intrinsic Toxicity 41:22 AI Bias From Bad Data 42:43 Sensitization Defined Wrong 47:38 Carcinogen Labels Need Dose 53:44 Threat Psychology and Symbols 59:14 Toxicologists Future Role 01:03:48 Closing and Resources