Used as a biomarker for dopamine metabolism in neurological research, as it is the principal metabolite of dopamine, helping assess dopaminergic activity in conditions like Parkinson’s disease and schizophrenia. Levels are commonly measured in tissues or biological fluids, such as cerebrospinal fluid, to evaluate central nervous system function. Also studied for its antioxidant properties due to its phenolic structure, which can scavenge free radicals, contributing to potential neuroprotective effects against oxidative stress. Found in biological samples to monitor gut microbiota activity, as it is a microbial metabolite of dietary polyphenols. Employed in analytical chemistry as a reference standard in HPLC and mass spectrometry methods for detecting catecholamines and related compounds. It has potential as a bioactive compound or standard for analyzing natural extracts with antioxidant activity.