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i.e., quick progressive (spermatozoa moved quickly in a linear way), slow progressive (spermatozoa moved slowly in a linear way), non-progressive (spermatozoa showed circular movements), and immotile (spermatozoa had no circular and linear movements)

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Effects of L-carnitine and L-acetyl-carnitine on testicular sperm motility and chromatin quality. Iranian journal of reproductive medicine 10.2 (2012): 77

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One study revealed that people suffering from type 2 diabetes who consumed anti-diabetic medication along with L-carnitine reported lower blood sugar levels as compared to those taking a placebo

doi: 10.1186/s12944-023-01867-3 39