Both are effective NAC works upstream, glutathione works downstream
L-carnitine is a derivative of the amino acid lysine and, as certain conditions outpace the bodys ability to produce it, l-carnitine is considered a conditionally essential amino acid
10.1111/acel.12213 Aging Cell 69 OlivieriF.AhtiainenM.LazzariniR.PollanenE.CapriM.LorenziM.et al (2014)
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Values of DEC were significantly greater (15-20%) greater across the five sprint bouts with 3.0 g or 4.5 g GPLC, but the 1.5 g GPLC supplementation produced DEC values -5%, -3%, +4%, +5%, and +2% different from the baseline PL values
Theranostics 12, 66656681