L-Carnitine Benefits for Men: Uses, Effects, and What Research Says
L-Carnitine is a natural substance that has become more popular among people who practice physical activities as well as any sports program aimed at increasing the level of their energy or changing body structure.
What is L-Carnitine?
L-Carnitine is an organic compound that is synthesized in the human body through the amino acids lysine and methionine. It is synthesized naturally in the body by the liver and kidneys; it is abundant in skeletal and heart muscles.
Carnitine is a natural component of the human body, which is provided by natural foods like meat, poultry, fish, and dairy products. The main function of carnitine in the human body is the production of energy, since carnitine moves fatty acids to mitochondria, where they are burned and provide energy. Healthy people have enough carnitine in their bodies.
Benefits of L-Carnitine to Men
The health benefits of L-carnitine to men are largely dependent on the health status, nutritional status, and level of physical activity of the man, as well as the objective of the supplement intake. Several scientific studies have been conducted on the benefits of L-carnitine for exercise, metabolism, and sexual health of men.
1. Supports Normal Energy Metabolism
One of the most obvious functions of carnitine is related to its role in the energy-producing process.
To burn long-chain fatty acids, you need to transfer them to the mitochondria. Carnitine plays the role of a transporter for fatty acids to the mitochondria.
Nevertheless, it doesn’t mean that L-carnitine supplementation increases energy levels. Usually, the natural levels of carnitine in the body are sufficient.
2. Can Improve Exercise Performance in Some Cases
L-carnitine is one of the most popular subjects of study among scientists because of the impact of L-carnitine on the process of fatty acid metabolism.
Scientists wanted to know whether L-carnitine supplementation could affect endurance, recovery, oxygen usage, perceived effort, and so forth.
There are no significant changes in the performance of a healthy person with a proper diet and training routine.
3. May Help With Exercise Recovery
Some studies have examined the possibility of lowering exercise-related stress marker levels through carnitine supplementation or improving the recovery process after exercise.
It has been shown through research summarized by NIH that some studies have reported improvement in muscle soreness or the recovery process, while others have not.
Therefore, the use of L-carnitine might help some individuals, but there needs to be further study before it becomes a definite recovery supplement for all athletes.
4. May Help Slightly With Weight Loss
As carnitine is associated with fatty acid metabolism, it has been researched as a weight-loss supplement.
It cannot be used as an extremely effective fat-burning supplement.
According to an NIH-reviewed meta-analysis of nine randomized clinical trials among 911 adults, the patients using carnitine supplements have lost an average weight of 1.33 kg more than placebo. But other studies show that there is no effect, and further research is required.
However, for men who wish to lose body fat, factors like calories consumed, protein consumed, resistance training, physical exercise, sleep, and diet quality will play a far more important role.
5. May Support Male Fertility
One of the most interesting areas of research when it comes to L-carnitine is male reproductive health.
This substance is responsible for sperm energy metabolism, which has attracted attention for examining its effect on the sperm quality of men suffering from infertility issues.
As per a literature review based on NIH, L-carnitine or acetyl-L-carnitine supplementation improved sperm motility and morphology in some cases.
Still, the available evidence is not sufficient to assume that L-carnitine supplementation may increase the chances of having children for infertile men.
For instance, men who have problems with conceiving must consult a specialist regarding supplements that they may take.
6. May Help with Metabolic Health Issues
Metabolic health and glucose and insulin metabolism are also areas where L-carnitine supplementation can be examined.
According to a 2023 NIH meta-analysis of 41 randomized clinical trials, L-carnitine supplementation reduced the level of blood glucose, insulin resistance, and HbA1c among participants in this study.
L-Carnitine and Muscle Building
Another frequently asked question by those who are into weight lifting is whether L-carnitine aids in muscle building.
L-Carnitine is ineffective as far as muscle building is concerned compared to other substances such as protein and creatine. Its biological significance is more associated with the metabolism of fatty acids. While various exercises and recovery research has been done, there is no scientific evidence to support that L-Carnitine is an effective supplement for muscle building in males.
In order for someone to build muscle, he has to do regular workouts combined with proper nutrition, especially protein and calories.
Food Sources for L-Carnitine
No need to take any carnitine supplements for males.
It can be acquired through certain foods.
| Food | Approximate Carnitine per Serving |
| Cooked beef steak, 3 oz | 42–122 mg |
| Cooked ground beef, 3 oz | 65–74 mg |
| Whole milk, 1 cup | About 8 mg |
| Cooked cod, 3 oz | 3–5 mg |
| Cooked chicken breast, 3 oz | 2–4 mg |
| Cheddar cheese, 2 oz | About 2 mg |
Should Men Take L-Carnitine Supplements?
Not really.
Most healthy adults are able to synthesize sufficient quantities of carnitine, and currently, there is no official recommended daily intake of carnitine for healthy individuals.
Supplementation may be taken into account in certain cases, but for good reasons.
For instance, one person taking L-carnitine for fitness purposes has reasons quite different from another individual who uses the substance on a doctor’s advice to cope with a deficiency.
The supplement should thus be perceived as an extra product to take rather than a necessary one to achieve the desired fitness results.
L-Carnitine Dosage for Men
There is no standard recommended dosage of L-carnitine for healthy males.
In research, various forms and dosages have been employed for supplementation, depending on its intended purpose. The NIH emphasizes that supplemental L-carnitine can contain various quantities of the substance.
Instead of just opting for a larger dose due to some marketing claims, it would be much better to read the instructions on the package and talk to a doctor about supplementation when a health problem is involved.
When Is the Best Time to Take L-Carnitine?
Despite its reputation as a pre-workout or fat-burning supplement, there is no one-size-fits-all way that taking L-carnitine before workouts will ensure that one experiences positive results.
The effect of L-carnitine on the body is much more complicated than providing an energy surge.
Should one decide to consume it, the consistency and the entire diet/training regimen matter more than being fixated on when to take it to the exact minute.
Side Effects of L-Carnitine
According to the NIH, L-carnitine is generally safe and well-tolerated at moderate doses, although side effects can occur.
These may include:
- Nausea
- Vomiting
- Abdominal cramps
- Diarrhea
- Body odor like that of a fish
L-Carnitine Vs. Fat Burners
While L-carnitine is marketed as a fat burner, this product is not as much as it is promoted.
The biological function of L-carnitine is fatty acid transportation into the mitochondria. However, this biological function doesn’t mean that it works as a fat burner.
To lose weight effectively, you need to take into account the following steps:
- Caloric deficit
- Protein intake
- Strength training
- Physical activity
- Sleep
- Nutrient-dense diet
Who May Want to Discuss L-Carnitine With a Doctor?
Despite the fact that healthy people normally produce enough carnitine, there can be some cases of insufficient carnitine content due to certain health conditions.
The following information might be very useful if:
- You have kidney disease
- You suffer from seizures
- You have metabolic issues
- You take medications
- You take supplements due to fertility problems
- You want to consider high-dose carnitine supplementation
Conclusion
The L-carnitine health benefits that are supposed to help men in sports are much more complicated than advertised by the majority of supplement manufacturers. There are some well-grounded facts proving that carnitine takes part in energy metabolism, and scientists examined whether carnitine could influence male physical performance, recovery, weight loss, metabolism, and fertility. However, there were great differences in study results. Healthy adults normally produce enough carnitine.
