* 4 years: Bachelor's degree in a related science field (biology, chemistry, etc.)
* 4 years: Doctoral degree (PhD) in toxicology or a closely related field. Some toxicologists may choose a Doctor of Veterinary Medicine (DVM) degree, followed by further specialization.
* 0-2 years (optional): Postdoctoral research experience is often required for academic or research positions, though not always necessary for industry roles.
Therefore, while a bachelor's degree might allow for some entry-level positions related to toxicology, a doctoral degree is generally necessary for a full-fledged career as a toxicologist.