l carnitine dietary sources L-Carnitine – Benefits for Fat Burning and How to Use Source Naturals L-Carnitine, Metabolic Energy*,

Figure 2 3.4 Correlations between S-5-HT and fatigue levels There was a negative correlation between S-5-HT and fatigue scores, such that increased serotonin levels were associated with reduced fatigue

Genetic deficiencies of transporter activity represent the only known forms of primary carnitine deficiency [27]

L-carnitine accomplishes this by binding to acyl residues produced not only from fatty acids but also from amino acid metabolism, forming water-soluble acylcarnitines that facilitate their excretion from cells and ultimately the body (Figure 1) ( 2.4 Stabilization of cell membranes L-carnitine is also essential in maintaining membrane stability and the function of plasma, mitochondria, and other organelles, probably through its effects on the acetylation of membrane phospholipids

While some carnitine can move passively into cells, for optimal cellular function or for times of physical stress, the OCTN2 transporter is essential