Regulatory guidelines in toxicology provide frameworks and recommendations for conducting toxicological studies, assessing the safety of chemicals, and managing potential risks to human health and the environment. These guidelines are developed by regulatory agencies at the national and international levels and serve as important references for industry, researchers, and policymakers. Here are some key regulatory guidelines in toxicology:

1. International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH): The ICH provides guidelines for the development and registration of pharmaceuticals, including guidelines related to nonclinical safety studies. These guidelines cover topics such as general principles of safety pharmacology, genotoxicity testing, carcinogenicity testing, reproductive toxicology, and immunotoxicity.
2. Organization for Economic Cooperation and Development (OECD): The OECD develops guidelines for testing and assessing the safety of chemicals. These guidelines cover various aspects of toxicology, including acute toxicity, repeated dose toxicity, genotoxicity, reproductive and developmental toxicity, endocrine disruptor testing, and environmental toxicity testing. The OECD guidelines are widely used and recognized by regulatory authorities worldwide.
3. U.S. Environmental Protection Agency (EPA): The EPA develops guidelines for assessing the environmental and human health risks of chemicals. These guidelines include testing protocols for assessing acute and chronic toxicity, mutagenicity, carcinogenicity, reproductive and developmental toxicity, neurotoxicity, and ecological effects. The EPA guidelines are used to support the registration and regulation of chemicals in the United States.
4. U.S. Food and Drug Administration (FDA): The FDA provides guidelines for the safety assessment of various products, including pharmaceuticals, medical devices, food additives, and cosmetics. The FDA guidelines cover topics such as nonclinical safety evaluation, biocompatibility testing of medical devices, genotoxicity testing, reproductive and developmental toxicity testing, and immunotoxicity assessment.
5. European Medicines Agency (EMA): The EMA provides guidelines for the evaluation and regulation of pharmaceuticals in the European Union. These guidelines include requirements for nonclinical safety studies, genotoxicity testing, reproductive toxicity testing, carcinogenicity testing, immunotoxicity testing, and safety pharmacology assessment.
6. National Institute for Health and Care Excellence (NICE): NICE provides guidelines for assessing the safety and efficacy of healthcare interventions, including pharmaceuticals and medical devices. NICE guidelines cover topics such as health technology assessment, clinical trial design, risk assessment, and evidence-based decision-making.
7. World Health Organization (WHO): The WHO develops guidelines for the safety assessment of chemicals, including pesticides, food additives, and contaminants. These guidelines cover various toxicological aspects, such as acute toxicity, chronic toxicity, reproductive and developmental toxicity, genotoxicity, and carcinogenicity.

These are just a few examples of regulatory guidelines in toxicology. Many countries have their own regulatory agencies that develop guidelines specific to their jurisdiction. It is important for researchers, industry professionals, and regulatory authorities to stay updated on the latest guidelines to ensure the appropriate design, conduct, and evaluation of toxicological studies and risk assessments. Adhering to regulatory guidelines helps ensure the safety of chemicals, products, and interventions and protects human health and the environment.