l carnitine shuttles fatty acids into mitochondria in Mitochondrial Acid Transport and β-Oxidation Carnitine Acyltransferase - an overview

Nizon M, Ottolenghi C, Valayannopoulos V, Arnoux JB, Barbier V, Habarou F, Desguerre I, Boddaert N, Bonnefont JP, Acquaviva C, Benoist JF, Rabier D, Touati G, de Lonlay P (2013) Long-term neurological outcome of a cohort of 80 patients with classical organic acidurias

2004 Jul 27;101(30):1115911164

This substantial deacetylation is the reason that high plasma levels of acetyl-l-carnitine are not observed after its oral intake, unlike after parenteral administration, during which the substance bypasses the gut and enters the bloodstream directly

Injections bypass the digestive system for faster, more potent results

Son muchas las empresas que actualmente comercializan suplementos con L-carnitina en el mercado, pero no todas son fiables, pues el proceso de aislamiento es costoso