l-carnitine vs l-arginine for hemodialysis patients The Renal Safety of L-Carnitine, L-Arginine, and Glutamine in Athletes and Bodybuilders Hemodialysis and L-arginine, but not
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"Acetyl-L-Carnitine Supplements Review." 8

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Note that many of these studies comprised marginal or deficient vitamin C status at baseline

For general daily supplementation, both forms are effective