Biochemistry Proteins and Amino Acids 6bf6746d N Acetyl Cysteine replenishes: A Glutathione B Glycine C Glutamate D GABA High-Yield Explanation Ans. A. GlutathioneThe active part of both Glutathione and N Acetyl Cysteine is Sulfhydryl group of Cysteine. So N Acetyl Cysteine replenishes Glutathione.