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Moreover, Itoh et al

The NAD biosynthesis pathway mediated by nicotinamide phosphoribosyltransferase regulates Sir2 activity in mammalian cells

Schmoll D, Engel CK, Glombik H

Glutathione is considered safe for most adults when used orally, inhaled, or injected intramuscularly or intravenously

Low glutathione levels have been linked to abnormalities in the lungs' lining, and having normal glutathione levels may protect from inflammation by protecting lung tissue from free radical damage.27 Additionally, animal studies found that intravenous glutathione supplementation helped maintain normal lung function and prevent damage such as decreased lung compliance, increased swelling, and reduced lung tissue

NAD+ precursor supplements (NR or NMN) and direct glutathione supplementation both increase their respective molecules, with clinical trials showing 40-90% increases in blood levels at appropriate doses