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In addition to its critical role in the survival of sensory neurons and neurite outgrowth, NGF signalling is also involved in nociception by activating nociceptive neurons, which express high-affinity NGF receptors [27]

In humans, administration of 2 g/day of ALCAR for 50 days increased plasma ALCAR concentrations by 43%, suggesting that either ALCAR was absorbed without prior hydrolysis or that L-carnitine was re-acetylated in the enterocytes (5)

Conclusion Carnitine as a nutritional supplement has, since the 1960s, been promoted as beneficial in a number of disorders of human carnitine deficiency of impaired fatty acid oxidation, suggesting that nutritional or pharmacologic supplements of carnitine might be beneficial in some disorders [168]

In this case, the mechanism of down-regulation is linked to promoter methylation (Scalise et al., 2012