difference between l-carnitine and acetyl l-carnitine Kirkman - 250 mg -Hypoallergenic it is worth looking at the NOW Foods brand Vital Nutrients - Acetyl L-Carnitine

doi:10.1038/ijo.2016.220 423. Jiang Y, Liang M, Chen L, Wang J, Huang Y, Huo H, Xiao D, Hu Y, Wang Z, Ji Q, et al

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A second finding was that during the second round of selection, it took the passage population of each transfer 24 h less than the first-round selection to grow from an initial OD 600 of 0.5 to an early mid-exponential phase (OD 600 of ~15) (data not shown), which could be because the GSH production capacity of the evolved strain nearly counteracted the stressed pressure of Acr of each transfer, leading to a lack of severe growth inhibition

J Biol Chem 285:61186126 Turrens JF (2003) Mitochondrial formation of reactive oxygen species

Nature 414 , 799806 (2001)