l arginine verses l-carnitine 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 Increases the neurotransmitter content of brain cells L-Carnitine | Linus Pauling Institute
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Multiple studies suggest supplemental ALCAR improves cognitive function and energy levels, delays onset and improves symptoms of dementia and Alzheimers, improves feelings of depression (especially in the elderly) and may provide benefits for Downs syndrome, Parkinsons, stroke and other neurological disorders, along with many other conditions

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Consequently, despite the potential for higher initial blood levels, the inherent physiological immaturity and reduced somatic mass associated with preterm birth mean that these infants have significantly diminished endogenous L-carnitine reserves

then, a decrease of acetyl-CoA/CoA ratio can relieve the inhibition of PDH thus affecting glucose oxidation

L-carnitine is believed to improve your bodys ability to burn fat and lose weight