NAC and Nitric Oxide don't play well for performance However, NAC has its own limitations, which is why glutathione supplementation is still being explored
You can slather it on twice daily for at least six weeks (and no more than six months)
However, the absorption rate through the gastrointestinal tract is deficient so the physicians at The HCG Institute always recommend giving it via injections

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Direct and simultaneous determination of reduced and oxidized glutathione and homoglutathione by liquid chromatography-electrospray/mass spectrometry in plant tissue extracts