l carnitine is derived from L-Carnitine in Mitochondria Functional mechanisms of L-carnitine: ①
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P.de BoerR
It is FDA-approved as Carnitor for carnitine deficiency, providing extensive human safety data

Li M, Chi X, Wang Y, Setrerrahmane S, Xie W, Xu H

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Researchers found that, after six months, carotenoid supplementation led to decreased levels of an inflammatory cytokine (interleukin-1), increased brain-derived neurotrophic factor (BDNF) levels and antioxidant capacity, and better performance on tests of memory, attention, and processing speed

Metabolic changes induced by maximal exercise in human subjects following L-Carnitine administration
