is using l carnitine ethical journal L-Carnitine and Male Fertility: Supplementation Beneficial? The effect of L-carnitine supplementation
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Morphological and functional metabolism studies link chronic pain and depressive disorders to dysfunctional neuroplastic changes in fronto-limbic brain regions that control emotional responses to painful injuries and stressful events

Current serotonin medications are aimed at increasing central 5-HT neurotransmission in the brain, and there are no approved indications for manipulating peripheral 5-HT, though peripheral 5-HT synthesis is being considered as a potential target for developing pharmacological agents in some disorders ( We are not aware of prior studies reporting low S-5-HT in hypothyroidism or CFS

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"Meta-analysis of ALCAR vs placebo in MCI and mild Alzheimer's." Int Clin Psychopharmacol 2003;18:61-71