Healthy people, with no evidence of deficiency of glutathione, as we intimated earlier, do not need glutathione supplement. The glutathione derived from food will, as a rule, be enough for them to maintain healthy cells, unless they abuse themselves by smoking, excessive alcohol intake, using illegal drugs, etc. When healthy individuals use glutathione anyway, intravenously or by nasal aerosol, their body will not have any added protection or benefit. They will just be wasting money and subjecting themselves to yet undefined potential health risks associated with long-term use of the exogenous (laboratory-produced) glutathione.