Exogenous biomarkers, often derived from dietary or environmental sources, reflect nutrient intake or dietary exposure. These markers are particularly useful in research settings for verifying dietary adherence and understanding the impact of specific nutrients. For instance, certain metabolites found in blood or urine can indicate the intake of fruits, vegetables, or specific compounds like polyphenols and flavonoids. Research on exogenous biomarkers is essential for identifying accurate markers of nutrient intake, as these markers help validate self-reported dietary data and enhance the precision of studies linking diet to health outcomes. By using exogenous biomarkers, researchers can establish stronger links between diet and health, advancing our understanding of nutrition science.