Bioavailability Comparison Summary Standard reduced glutathione capsule: Variable estimated 20 to 40 percent systemic availability due to gut degradation Liposomal glutathione: Significantly higher studies show 2 to 4 times greater blood level increases versus standard capsules Sublingual glutathione: High bypasses gut entirely, but fewer commercial options NAC (oral): Well-absorbed 4 to 10 percent oral bioavailability but highly effective as a precursor due to intracellular synthesis How Much Glutathione Should You Take
International Journal of Cosmetic Science 27(3):155-160. [doi.org]
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Hurlstone DP, Cross SS, Slater R, Sanders DS, Brown S (2004) Detecting diminutive colorectal lesions at colonoscopy: a randomised controlled trial of pan-colonic versus targeted chromoscopy
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