👉 Nontoxic or non-toxic refers to substances that are not harmful, toxic, or hazardous to human health. These substances may be derived from natural sources like plants and minerals, but they do not contain any harmful chemicals, toxins, or other substances that could cause harm when ingested or inhaled. Examples of nontoxic substances include: - Water: Pure water is a non-toxic substance. - Air: Nitrogen (O2) and oxygen (O2) are nont