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The combination of superior bioavailability, rigorous research validation, and pharmaceutical-grade manufacturing provides the foundation for premium products that justify their positioning through measurable functional benefits
Huang HY, Helzlsouer KJ, Appel LJ
doi:10.1146/annurev.pharmtox.45.120403.095857
You can also get it from supplements, but most of it is broken down by enzymes in the gut into amino acids, such that only long-term use of large amounts (500 mg or more) appears to modestly raise glutathione levels
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