from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A betaine commonly occurring in the liver and in skeletal muscle that functions in fatty acid transport across mitochondrial membranes.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A betaine 3-hydroxy-4-trimethylammonio-butanoate that occurs in the liver and has a function in fatty acid transport


from The American Heritage® Dictionary of the English Language, 4th Edition

German Karnitin, from Karnin, a basic substance derived from meat, from Latin carō, carn-, flesh; see carnal.


  • L-carnitine is a nutrient that is involved in fat transport and metabolism.

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  • In addition, analysis of the mitochondrial lipid transport enzyme known as carnitine palmitoyltransferase 1 CPT1 revealed increased fat transferred into the mitochondria to be utilized more efficiently for energy and reduced oxidative damage in the presence of astaxanthin.

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  • Within limits, either lowered fat intake or increased vitamin E intake will bring about the same improvement in blood chemistry, and either decreasing the amount of sugar in the diet or increasing the amount of a nutrient called carnitine will lower undesirable blood chemicals called triglycerides.

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  • Fatty acids from the cytoplasm are attached to a molecule called carnitine to transport them across the mitochondrial membrane.

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  • Unlike l-carnitine, which is a good fat-burning nutrient, which doesn’t cross into the brain, the acetyl l formulation does.

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  • CardioFuel claims that its "ATP boosting" properties are not just from ribose, but also from other molecules such as carnitine and coenzyme Q10.

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  • Stimulant drugs for ADD and ADHD can deplete the amino acid carnitine, especially worrisome in vegetarians, since it's found in meat.

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  • Metabolic markers for disorders of fatty acid metabolism and some of the organic acid disorders include total and free carnitine levels and an acylcarnitine profile, are measured using tandem mass spectrometry.

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  • Plus, those drinks often have a slew of other ingredients of dubious value, such as taurine, l-carnitine, guarana also a source of caffeine, and glucuronolactone.

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  • These include metabolite measurements for plasma, urine and cerebrospinal fluid amino acids using ion exchange chromatography, urine organic acids using gas chromatography/mass spectrometry, and total and free carnitine levels and quantitative acylcarnitine profiles using electrospray tandem mass spectrometry.

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