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Role of carnitine in disease
Open accessAbstract
Carnitine is a conditionally essential nutrient that plays a vital role in energy production and fatty acid metabolism. Vegetarians possess a greater bioavailability than meat eaters. Distinct deficiencies arise either from genetic mutation of carnitine transporters or in association with other disorders such as liver or kidney disease. Carnitine deficiency occurs in aberrations of carnitine regulation in disorders such as diabetes, sepsis, cardiomyopathy, malnutrition, cirrhosis, endocrine disorders and with aging. Nutritional supplementation of L-carnitine, the biologically active form of carnitine, is ameliorative for uremic patients, and can improve nerve conduction, neuropathic pain and immune function in diabetes patients while it is life-saving for patients suffering primary carnitine deficiency. Clinical application of carnitine holds much promise in a range of neural disorders such as Alzheimer's disease, hepatic encephalopathy and other painful neuropathies. Topical application in dry eye offers osmoprotection and modulates immune and inflammatory responses. Carnitine has been recognized as a nutritional supplement in cardiovascular disease and there is increasing evidence that carnitine supplementation may be beneficial in treating obesity, improving glucose intolerance and total energy expenditure.
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“The bioavailability of L-carnitine in vegetarians (who are adapted to low-carnitine diets) was higher than in carnivores (42); therefore, less carnitine reaches the bacteria of the lower intestine in vegetarians.”
From Trimethylamine N -Oxide, the Microbiome, and Heart and Kidney Disease (2017) · cites this paper as [42]
In the citing paper
“Carnitine also can be synthesized endogenously from two essential amino acids, lysine and methionine (63).This occurs in kidney, liver, and brain (42).”
From Trimethylamine N -Oxide, the Microbiome, and Heart and Kidney Disease (2017) · cites this paper as [42]
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“Animal products like meat, fish, poultry, and milk (whey fraction) are highest in carnitine, whereas plants contain little carnitine (42).”
From Trimethylamine N -Oxide, the Microbiome, and Heart and Kidney Disease (2017) · cites this paper as [42]
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InfluentialAssociation of carnitine insufficiency with sarcopenia and dynapenia in patients with heart failure
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“Nonetheless, study into significant aids of levocarnitine supplements inside heart failure has produced mixed results [33].”
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“…circumstances, such as in some genetic disorders such as carnitine transporter deficiency syndromes (Longo et al., 2006; Glenn and Gardner, 2007; Flanagan et al., 2010; Magoulas and El-Hattab, 2012), that a case of carnitine deficiency after long-term total parenteral nutrition (TPN) has been…”
BackgroundCombined Metabolic Activators Improves Cognitive Functions in Alzheimer's DiseasePreprint
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αKG-mediated carnitine synthesis promotes homologous recombination via histone acetylationPreprint
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“As a key cofactor in fatty acid metabolism, Carnitine is integral to energy metabolism and fatty acid oxidation 24 .”
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“Plasma L-carnitine (present in meat) and its derivatives may be related to development and progression of chronic HF(34,35,41,42).”
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“ELOVL2 was negatively correlated with lysine, which in addition to roles in protein synthesis is used to produce carnitine to aid in fatty acid transport into and out of the mitochondria for b-oxidation (58).”
BackgroundPrecision Neuronutrition: Personalized Approaches for Optimizing Brain Health
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“…hypotension, burning Neurological manifestations of carnitine deficiency include hypotension, burning pain, decreased endurance, sensory impairment, developmental delay, rigidity and myopathy [57,58]. pain, decreased endurance, sensory impairment, developmental delay, rigidity and myopathy [57,58].”
BackgroundComparison of canine colostrum and milk using a multi-omics approach
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“Carnitine is an essential nutrient, and it plays a key role in fatty acid metabolism and cellular energy production [57, 58].”
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“The remaining carnitine can be synthesized endogenously in the liver, so older children are less prone to carnitine deficiency compared with neonates or premature infants (24).”
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“This process is regulated by the activity of carnitine palmitoyltransferase (CPT)1, a mitochondrial enzyme responsible for the synthesis of acylcarnitines, a key regulator of β-oxidation rates [21, 22].”
BackgroundGhaffari, M. H., Sauerwein, H., Sadri, H., Schuchardt, S., Martín‐Tereso, J., Doelman, J., & Daniel, J. (2025) · Journal of Dairy Science · doi:10.3168/jds.2025-26273 · Cited by 6
Sood, V., Rawat, D., Khanna, R., Sharma, S., Gupta, P. K., Alam, S., & Sarin, S. K. (2016) · Journal of Pediatric Gastroenterology and Nutrition · doi:10.1097/mpg.0000000000001510 · Cited by 6
Chen, P., Ho, C., Shahidi, F., & Pan, M. (2018) · Journal of Food Bioactives · doi:10.31665/jfb.2018.3151 · Cited by 6
Carnitine analysis in pterygium
Sağlık, A., Koyuncu, İ., Yalçın, H., Adıbelli, F. M., Gönel, A., & Toptan, M. (2020) · Arquivos Brasileiros de Oftalmologia · doi:10.5935/0004-2749.20200001 · Cited by 6
“While 99% of carnitines are within the cell, levels of FC and AC in the blood circulation are demonstrated in the homeostasis of the whole organism(12).”
BackgroundMetabolic Profiling Reveals Changes in Serum Predictive of Venous Ulcer Healing
Bergner, R., Onida, S., Velineni, R., Spagou, K., Gohel, M., Bouschbacher, M., Bohbot, S., Shalhoub, J., Holmes, E. C., & Davies, A. H. (2021) · Annals of Surgery · doi:10.1097/sla.0000000000004933 · Cited by 7
“5024 Ulcer area, cm3, (SD) 27 (38) 65 (50) 0.”
Sadri, H., Ghaffari, M. H., Schuh, K., Koch, C., & Sauerwein, H. (2021) · Scientific Reports · doi:10.1038/s41598-021-90577-w · Cited by 6
Isse, N., Miura, Y., Obata, T., & Takahara, N. (2013) · Journal of Medical Case Reports · doi:10.1186/1752-1947-7-286 · Cited by 6
“Normally, more than 95% of the body’s total carnitine content would be stored in skeletal muscle [6,7].”
BackgroundRising trend of diabetes mellitus amongst the undernourished: State -of- the -art review
Francis, N. K., Pawar, H. S., Mitra, A., & Mitra, A. (2016) · Diabetes & Metabolic Syndrome Clinical Research & Reviews · doi:10.1016/j.dsx.2016.12.027 · Cited by 6
Importance of Vitamin C in Human Health and Disease
Chisnall, M. A. W., & Macknight, R. C. (2017) · Springer eBooks · doi:10.1007/978-3-319-74057-7_19 · Cited by 6
Firouzabadi, L. I., Geer, K., & Mead, P. (2018) · Postgraduate Medical Journal · doi:10.1136/postgradmedj-2018-136029 · Cited by 6
Tan, Y. Y., Fong, W. Y. N., Chan, C. J., & Chandran, S. (2022) · BMJ Case Reports · doi:10.1136/bcr-2022-251321 · Cited by 6
An alternative source of medicines: pharmaceutical utilization of animal-derived metabolites
Renda, G. (2025) · Phytochemistry Reviews · doi:10.1007/s11101-025-10086-w · Cited by 5
“Research has demonstrated its efficacy in improving conditions such as Alzheimer’s disease, cardiovascular disease, and immune system function (Al-Dhuayan 2023; Calvani et al. 2000; Flanagan et al. 2010).”
Comprehensive Review of L-Lysine: Chemistry, Occurrence, and Physiological Roles
Hashim, M., Alam, I., Ahmad, M., Badruddeen, B., Akhtar, J., Khan, M. I., Islam, A., & Parveen, S. (2025) · Current Protein and Peptide Science · doi:10.2174/0113892037381647250526073248 · Cited by 5
Serum metabolome analysis in hyperthyroid cats before and after radioactive iodine therapy
Bechtold, M. A., Lin, Y.-M. J., Miller, M. L., Prieto, J. M., Frederick, C. E., Bennett, L. L., Peterson, M. E., Simpson, K. W., & Loftus, J. P. (2024) · PLoS ONE · doi:10.1371/journal.pone.0305271 · Cited by 5
Moiz, B., Walls, M., Vargas, V. A., Addepall, A., Weber, C. M., Li, A., Sriram, G., & Clyne, A. M. (2024) · Neurobiology of Disease · doi:10.1016/j.nbd.2024.106769 · Cited by 5
“Carnitines are important to mitochondrial function as they are involved in fatty acid oxidation (Flanagan et al., 2010).”
Gargiulo, S., Albanese, S., Megna, R., Gramanzini, M., Marsella, G., & Vecchiarelli, L. (2025) · Neuroscience · doi:10.1016/j.neuroscience.2025.01.044 · Cited by 5
“Interestingly, several studies have suggested that L-carnitine and acetyl-L-carnitine are also involved in neuronal metabolism and may play a neuroprotective role in hypoxic-ischemic brain injury (Wainwright et al., 2006; Zanelli et al., 2005; Flanagan et al., 2010).”
Wang, W., Sun, Y., Cao, R., Luo, W., Beng, S., Zhang, J., Wang, X., & Peng, C. (2025) · Ecotoxicology and Environmental Safety · doi:10.1016/j.ecoenv.2025.118060 · Cited by 5
Sani, S. W., Heswantari, S. R., Sudibya, S., Purnomo, S. H., & Hanifa, A. (2015) · Buletin Peternakan · doi:10.21059/buletinpeternak.v39i1.6156 · Cited by 5
Cell Protection by Oxidative Stress Mitigation Using Substances with Bioactive Properties
Požgajová, M., Klongová, L., Kovár, M., & Navrátilová, A. (2024) · Biochemistry · doi:10.5772/intechopen.1004522 · Cited by 6
Fish Oil Emulsions in the Management of Intestinal Failure-associated Liver Disease
Mercer, D. F. F. (2012) · Journal of Clinical Gastroenterology · doi:10.1097/mcg.0b013e318261836d · Cited by 5
Anthracycline-Induced Cardiotoxicity in Young Cancer Patients: The Role of Carnitine
Armenian, S. H. (2016) · Annals of Nutrition and Metabolism · doi:10.1159/000448322 · Cited by 5
Rad, E. Y., Eslampour, E., Falahi, E., Mardani, M., Hekmatdoost, A., Asbaghi, O., & Saboori, S. (2019) · Indian Journal of Gastroenterology · doi:10.1007/s12664-019-00983-2 · Cited by 5
Alanazi, W. A., Al-Harbi, N. O., Imam, F., Ansari, M. A., Alhoshani, A., Alasmari, A. F., Alasmari, F. F., Alanazi, M. M., & Ali, N. (2020) · Clinical and Experimental Pharmacology and Physiology · doi:10.1111/1440-1681.13455 · Cited by 5
Wang, Y., Zhou, N., Si, Y., Bai, Z., Li, M., Feng, W., & Zheng, X. (2021) · Evidence-based Complementary and Alternative Medicine · doi:10.1155/2021/8868690 · Cited by 5
“Because it is involved in cholinergic neurotransmission, its important property is neuroprotective, and it neutralizes the brain damage induced by oxidative stress [57].”
BackgroundKinugasa, Y., Sugihara, S., Yamada, K., Miyagi, M., MATSUBARA, K., Kato, M., & Yamamoto, K. (2016) · Journal of Aging Research and Lifestyle · doi:10.14283/jarcp.2016.116 · Cited by 5
Wang, X., Xiu, M., Wang, K., Su, X., Li, X., & Wu, F. (2022) · Metabolomics · doi:10.1007/s11306-022-01909-4 · Cited by 5
“Carnitine (3-hydroxy-4-N-trimethylaminobutyrate, C7H15NO3) is an essential dietary amino acid obtained from animal products such as meat, fish and milk, or is biosynthesized from l-lysine and l-methionine (Flanagan et al., 2010).”
BackgroundAlbogami, S. M. (2023) · Current Issues in Molecular Biology · doi:10.3390/cimb45030155 · Cited by 5
du Toit, W. L., Kruger, R., Gafane-Matemane, L. F., Schutte, A. E., Louw, R., & Mels, C. M. C. (2023) · Nutrition Metabolism and Cardiovascular Diseases · doi:10.1016/j.numecd.2023.05.010 · Cited by 5
Zalat, Z., Elewa, H., Abdel-Latif, M., El‐Din, M. A. A., & Kohaf, N. A. E. M. (2020) · Journal of Bioscience and Applied Research/Journal of Bioscience and Applied Research · doi:10.21608/jbaar.2020.119755 · Cited by 5
Neonatal carnitine concentrations in relation to gestational age and weight
Crefcoeur, L. L., der Velden, M. G. M. D. S., Ferdinandusse, S., Langeveld, M., Maase, R. E., Vaz, F. M., Visser, G., Wanders, R. J. A., Wijburg, F. A., Verschoof‐Puite, R. K., et al. (2020) · JIMD Reports · doi:10.1002/jmd2.12162 · Cited by 5
Vegetarian diet duration’s influence on women’s gut environment
Deng, X., Si, J., Qu, Y., Li, J., He, Y., Wang, C., & Zhang, Y. (2021) · Genes & Nutrition · doi:10.1186/s12263-021-00697-1 · Cited by 6
Rebouche, C. J. (2012) · doi:10.1002/9781119946045.ch25 · Cited by 5
Role of L-carnitine in exercise training: Anti-inflammatory, antioxidant, and metabolic interactions
Aminizadeh, S., Zarezadehmehrizi, A., Deh-Ahmadi, M. A., & Shahouzehi, B. (2025) · Advances in Redox Research · doi:10.1016/j.arres.2025.100149 · Cited by 4
Salamzadeh, J., Rezaee, H., Khalili, H., Jafari, S., & Abdollahi, A. (2012) · Future Virology · doi:10.2217/fvl.12.93 · Cited by 4
QT Prolongation in Dialysis Patients: An Epidemiological Study with a Focus on Malnutrition
Shibata, M., Ito, I., Tawada, H., & Taniguchí, S. (2021) · Blood Purification · doi:10.1159/000512961 · Cited by 4
Tango, R., Koeda, A., Nagamine, K., Tokito, S., Niwa, O., Ishikawa, S., & Sugimoto, M. (2022) · Analytical Sciences · doi:10.1007/s44211-022-00122-6 · Cited by 4
Weiß, K. J., Berger, U., Haider, M., Wagner, M., Märtner, E. M. C., Regenauer‐Vandewiele, S., Lotz-Havla, A. S., Schuhmann, E., Röschinger, W., & Maier, E. M. (2023) · Clinical Genetics · doi:10.1111/cge.14316 · Cited by 4
“Accordingly, secondary carnitine deficiency (SCD) is frequently encountered in inborn errors of metabolism (IEM) which are characterized by an accumulation of acylcarnitines such as glutaric acidemia type 1, isovaleric acidemia, and methylmalonic aciduria.(12,13) In most of these disorders, carnitine is regularly admi…”
Background
Metadata
- Authors
- Flanagan, J. L., Simmons, P. A., Vehige, J., Willcox, M. D., & Garrett, Q.
- Affiliations
- Brien Holden Vision Institute (AU)
- Allergan (United States) (US)
- Corresponding author
- Flanagan, Judith L
- Venue
- Nutrition & Metabolism
- Published
- 2010
- Volume
- 7
- Issue
- 1
- Pages
- 30
- ISSN
- 1743-7075 (ISSN-L)
- PMC
- PMC2861661
- OpenAlex
- W2084023408
- Cited by
- 611
- References
- 176
- Citations by year
- 2026: 27 · 2025: 50 · 2024: 46 · 2023: 43 · 2022: 62 · 2021: 64 · 2020: 61 · 2019: 40 · 2018: 45 · 2017: 30 · 2016: 30 · 2015: 31 · 2014: 36 · 2013: 19 · 2012: 18
- FWCI
- 9.03
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- Nutrition & Metabolism (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- UNSWorks (University of New South Wales, Sydney, Australia) (submittedVersion, cc-by-nc-nd)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Allergan
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
- Health Sciences › Nursing › Nutrition and Dietetics › Clinical Nutrition and Gastroenterology
- Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
- Keywords
- L-carnitine, carnitine deficiency, carnitine transporter, fatty acid metabolism, energy production, carnitine supplementation, primary carnitine deficiency, diabetes mellitus, sepsis, cardiomyopathy, malnutrition, liver cirrhosis, aging, uremia, neuropathic pain, Alzheimer's disease, hepatic encephalopathy, dry eye, obesity, impaired glucose tolerance, cardiovascular disease
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