L Arginine vs. L Carnitine Come see which nutrient best fits your needs Rexdrive Amino with L Arginine HCl, L Citrulline, Acetyl L Carnitine Arginate DiHydrochloride, and Glycine Cialis L Arginine L Carnitine Erectile Dysfunction: What the Evidence Shows and Practical Considerations L Arginine and L carnitine Arginine is an amino acid which we can also produce naturally . This increases your notice oxide production , human growth hormone and improves circulation. These three L Carnitine vs L Arginine for Erectile Dysfunction