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The ratio of GSH to GSSG within cells is often used as a marker for cellular oxidative stress, with a higher ratio indicating a more reduced (and less stressed) cellular environment

If you find the 45 unit mark uncomfortably small to read, the honest options are (a) use a finer-gradation syringe, or (b) follow a protocol built around the 50 mg vial, whose larger draw is more forgiving not to freehand a bigger volume from the 10 mg vial, which would silently overdose relative to the documented figure

10.1016/j.psj.2024.103795 275 ZhangT.HeM.ZhaoL.QinS.ZhuZ.DuX.et al (2021a)

Myogenic satellite cells: physiology to molecular biology