Pubmed (https://pubmed.ncbi.nlm.nih.gov/?term=grounding%20earthing) provides a dozen of studies with benefits of grounding, including cardiovascular, so there should be something to it. And I saw at least 2 more of them, where patients were beneficially grounded via a "neutral" electrical line in the wall socket. There are Direct Current Stimulation treatments to promote bone regeneration as well as for the brain and muscle and they minimally work. With grounding the type of energy may be a bit different, because Earth is a non-point source.