Carnitine Supplementation and Sperm Quality in Reproductive Biology
Summary
Carnitine, a naturally occurring quaternary ammonium compound, plays a central role in the transport of long-chain fatty acids into mitochondrial matrices, thereby facilitating β-oxidation and ATP generation. In the male reproductive tract, high concentrations of carnitine in the epididymal lumen support sperm maturation, motility and membrane integrity. Supplementation with L-carnitine has been explored as a strategy to enhance sperm function by bolstering energy metabolism and quenching reactive oxygen species. Studies spanning in vitro culture of human and animal sperm to in vivo models of metabolic stress have demonstrated that appropriate doses of L-carnitine can improve motility, viability, mitochondrial activity and zona pellucida binding. These effects have direct implications for assisted reproduction technologies, semen preservation and therapeutic intervention in subfertile males. Emerging research emphasises optimisation of dosage, timing and delivery medium to maximise the protective and bioenergetic benefits of carnitine while avoiding potential pro-oxidant or osmotic imbalances.
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Carnitine Supplementation and Sperm Quality in Reproductive Biology publication trend
The graph below shows the total number of articles in carnitine supplementation and sperm quality in reproductive biology across all publications each year (not limited to Nature Index journals).
Technical terms
Carnitine shuttle: Mechanism by which L-carnitine transports long-chain fatty acids into mitochondria for β-oxidation.
β-oxidation: Stepwise mitochondrial process that breaks down fatty acids to generate acetyl-CoA and ATP.
Reactive oxygen species (ROS): Chemically reactive molecules derived from oxygen that can damage lipids, proteins and DNA.
Zona pellucida binding: Attachment of sperm to the protective glycoprotein layer surrounding an oocyte, a key step in fertilisation.
References
- Genetic Association in the Maintenance of the Mitochondrial Microenvironment and Sperm Capacity. Oxidative Medicine and Cellular Longevity (2021).
- Accumulation of Carnitine by Bovine Spermatozoa during Maturation in the Epididymis. Journal of Biological Chemistry (1973).
- Effect of L-carnitine on sperm quality during liquid storage of boar semen. Animal Bioscience (2019).
- Effects of L-Carnitine on the sperm parameters disorders, apoptosis of spermatogenic cells and testis histopathology in diabetic Rats. International Journal of Reproductive BioMedicine (IJRM) (2019).
- L-Carnitine enhances porcine sperm quality, longevity, and zona pellucida binding in cooled semen. Animal Reproduction (2025).
- Supplementation of Cooling Extender With L-carnitine and Preserving Ram’s Sperm During Chilling Storage. Iranian Journal of Veterinary Medicine (2024).
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