Phytochemicals are natural bioactive compounds found in plants that have potential health benefits. These compounds can have various biological effects in the human body, such as antioxidant, anti-inflammatory, anti-cancer, and immune-stimulating properties. Phytochemicals are commonly found in fruits, vegetables, grains, herbs, and spices, and their consumption has been linked to reduced risk of chronic diseases such as cancer, cardiovascular disease, and diabetes. Research in the field of phytochemicals focuses on identifying and understanding the specific compounds responsible for these health benefits, as well as exploring their mechanisms of action and potential applications in the prevention and treatment of diseases.