I'd caution EFD members about buying any orally ingested glutathione
product, as the most recent literature reviews on glutathione confirm plasma
levels do not increase following oral ingestion in humans. I've asked HMP
for research references on the post oral ingestion plasma levels of their
product and received only a long list of animal and tissue research---which
does not list any studies that showed increased plasma levels of orally
ingested glutathione in humans. To date, the only proven effective methods
for raising cellular glutathione levels in humans remains intravenous
injections and oral administration of alpha lipoic acid---a precursor for
the synthesis of glutathione.