The Short Version
The core claim is physically plausible: the Earth carries a negative surface charge, and conductive barefoot contact can equalize electrical potential, transferring electrons to the body. Multiple peer-reviewed papers report measurable changes in body voltage during grounding. However, the supporting research comes from a narrow group of authors, uses small samples, and frequently hedges with speculative language. The magnitude and physiological significance of this electron transfer remain scientifically contested, and no large-scale independent replication has confirmed the mechanism's health relevance.