You must refer to the Safety Data Sheet (SDS), the Material Safety Data Sheet (MSDS) or the Product Safety Data Sheet (PSDS) before the reaction begins.
SDSs are described in detail in chemical catalogs, chemical compounds, and chemical mixtures. SDSs are likely to provide information about the material use agenda and the risks involved if the product is not followed. These orders may vary depending on the manufacturer even in one country (https://en.wikipedia.org/wiki/Safety_data_sheet )
Also, you can see these articles and I hope that they will be useful.
Harmful Health Effects of Some Common Organic Compounds Used in Daily Life as Households
Metabolism and effects of organic compounds in animals
Well, drug development and safety testing (if that's what you mean by organic matter) is a long and expensive process generally. Drugs are tested first on cell culture lines (well, of living beings, before that there are in vitro tests) to see it it's generally toxic, but immortalized (cancerous) cell lines don't make a good representation for human body. Then goes animal testing to see if there is activity/toxicity. Next after some time you can go to human trials if previous steps went well. There are methods to remove experimental bias (double-blind placebo-controlled research) so after that research is completed and target activity is proven and toxicity is considered tolerable, you get what can be considered a drug for use.