phytochemical

This term is primarily used in scientific, nutritional, and medical registers. It describes a broad category of non-nutritive plant chemicals, such as flavonoids or carotenoids, which are distinguished from essential nutrients like vitamins and minerals. In a research context, it often carries a positive connotation associated with health promotion and disease prevention.

When used as an adjective, it describes the nature of a substance or a process of analysis. When used as a noun, it refers to the specific molecule itself. Because it is a technical term, it is rarely encountered in casual conversation and is typically found in academic journals, health supplements labeling, or dietary guidelines.