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The Use of Carnitine in Pediatric Nutrition

Departments of Clinical Pharmacy and Pediatrics, Center for Pediatric Pharmacokinetics and Therapeutics, The University of Tennessee Health Science Center, and Le Bonheur Children's Medical Center, Memphis, Tennessee

Correspondence: Correspondence: Catherine M. Crill, PharmD, BCPS, BCNSP, Department of Clinical Pharmacy, University of Tennessee Health Science Center, 26 South Dunlap, Suite 210, Memphis, TN 38163. Electronic mail may be sent to ccrill{at}utmem.edu.

Carnitine is synthesized endogenously from methionine and lysine in the liver and kidney and is available exogenously from a meat and dairy diet and from human milk and most enteral formulas. Parenteral nutrition (PN) does not contain carnitine unless it is extemporaneously added. The primary role of carnitine is to transport long-chain fatty acids across the mitochondrial membrane, where they undergo β-oxidation to produce energy. Although the majority of patients are capable of endogenous synthesis of carnitine, certain pediatric populations, specifically neonates and infants, have decreased biosynthetic capacity and are at risk of developing carnitine deficiency, particularly when receiving PN. Studies have evaluated for several decades the effects of carnitine supplementation in pediatric patients receiving nutrition support. Early studies focused primarily on the effects of supplementation on markers of fatty acid metabolism and nutrition markers, including weight gain and nitrogen balance, whereas more recent studies have evaluated neonatal morbidity. This review describes the role of carnitine in metabolic processes, its biosynthesis, and carnitine deficiency syndromes, as well as reviews the literature on carnitine supplementation in pediatric nutrition.

Nutrition in Clinical Practice, Vol. 22, No. 2, 204-213 (2007)
DOI: 10.1177/0115426507022002204


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