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Furthermore, the use of glutathione precursors (NAC, glycine and glutamic acid) as supplements has been shown to be well tolerated, with no specific time limit for how long you can use them
Science 276, 6066 (1997)
The bioefficacy of an oral glutathione supplement formulation is determined by its bioavailability and absorption of the active ingredient in the body
You may need to have injections on a regular basis
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