The term "not fit for human consumption" is a warning label that indicates the product is not safe for consumption. It is a phrase used to describe toxic or contaminated food, beverages or other substances that can pose serious health risks. In the food industry, this label may be applied to products that contain harmful ingredients or have been improperly prepared or stored. Some synonyms for "not fit for human consumption" include inadequate, inedible, contaminated, poisonous, harmful, unsuitable, and dangerous. It is important to take such warnings seriously to avoid serious health complications. In case of doubt, it is always advisable to seek professional advice.