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Moreover, L-Carnitine has shown superiority over other antioxidants such as vitamin E and CoQ10 in terms of improving sperm quality and increasing pregnancy rates [39]

Vitamin B12 is crucial for many bodily functions

GCL forms an unusual peptide bond between the -carboxyl of glutamate and the amino group of cysteine using the energy provided by the hydrolysis of ATP (Lu, 2013)

This varies by treatment and by person

All assessments were conducted by two reviewers independently, and any disagreements were resolved through discussion or adjudication by a third reviewer

This indicates a high study quality for all our included articles