All About L-carnitine: Weight loss, 5 Benefits, Resources & Much More!

The human brain, liver, and kidneys produce the molecule L-carnitine. It improves the body’s conversion of fat to energy.

Check out our VivaSlim Review, a supplement that contains L-carnitine as its main ingredients.

For the proper operation of the heart, brain, muscles, and many other bodily systems, L-carnitine is essential. L-carnitine may be transformed by the body into the substances acetyl-L-carnitine and propionyl-L-carnitine. However, it’s unclear whether these additional carnitines offer the same advantages.

When a person’s natural level of L-carnitine is too low, L-carnitine is utilized to raise such levels. In addition, some people take L-carnitine for significant renal illness, diseases of the heart and blood arteries, and several other conditions, but there isn’t any solid scientific evidence to back these claims.

What is L-carnitine?

Molecule Structure

L-carnitine is a form of carnitine, which is an amino acid derivative. Proteins, which are composed of amino acids, perform a variety of vital functions for the body. Carnitine aids in the body’s conversion of fatty acids into energy that powers the cells.

L-carnitine is a conditionally necessary nutrient, which means that while the body can often produce enough of it, there are some circumstances in which a person may need to obtain the substance through food or oral supplements if their body is unable to do so.

L-carnitine is produced in the body by the liver and kidneys from the amino acids lysine and methionine.

L-carnitine can also be stored by the kidneys for later use, and any extra can be excreted through the urine.

Your cells’ mitochondria function as engines, burning these lipids to provide usable energy.

The amino acids lysine and methionine can be used by your body to create L-carnitine.

You also need a lot of vitamin C for your body to generate it in adequate proportions.

You can get tiny quantities of L-carnitine in addition to what your body produces by consuming things like meat or fish from animals.

Vegans or those with specific genetic conditions may not be able to generate or get sufficient amounts. Thus, L-carnitine is a nutrient that is only seldom required.

Make sure to read, the L-arginine ingredient for weight loss.

How does L-carnitine work on your body?

In the process of producing energy, carnitine is essential. Long-chain fatty acids are transported into the mitochondria where they can be oxidized (or “burned”) to release energy. In order to prevent their buildup, it also transfers the poisonous substances produced by this cellular organelle. 

Carnitine is abundant in tissues like skeletal and cardiac muscles that use fatty acids as a source of dietary fuel because of their vital roles.

The majority of people’s demands for carnitine are met by the body’s production. Carnitine is a substance that certain people (like preterm newborns) cannot produce enough of due to genetic or medical causes, making it a conditionally important vitamin for them.

Your body uses L-carnitine primarily for energy generation and mitochondrial function.It facilitates the movement of fatty acids into mitochondria within cells, where they may be used as fuel.

Your muscles store the majority of your L-carnitine, with little quantities being present in your liver and blood.

A significant factor in illness and good aging is mitochondrial activity, which L-carnitine may help improve.

The many types of carnitine may be utilized to treat a variety of ailments, such as heart and brain problems, as evidenced by more recent studies.

Foods containing L-carnitine:

According to the National Institutes of Health, while the majority of individuals don’t need to make an extra effort to eat foods high in carnitine, some genetic or medical problems might prevent the body from producing enough of the vitamin on its own, resulting in a shortage (NIH).

The Food and Nutrition Board of the National Academies has not issued a recommended dietary requirement for L-carnitine since it is not regarded as an essential nutrient for the majority of people.

Some of the foods which potentially contain L-carnitine are:

  • Beef
  • Pork
  • Whole milk
  • Chicken breast
  • Avocado
  • Cod

How does L-carnitine help in weight loss?

L-carnitine makes sense in principle as a weight-loss supplement.

You may assume that since L-carnitine facilitates the movement of more fatty acids into your cells for energy-burning, your capacity to burn fat and lose weight would be increased.

However, due to the complexity of the human body, both human and animal investigations have shown inconsistent results.

There was no difference in weight reduction between those who took L-carnitine and those who did not during eight-week research with 38 women who exercised four times per week.

Five of the subjects who took L-carnitine also reported having nausea or diarrhea.

Another human investigation tracked the impact of L-carnitine on fat burning after a 90-minute workout on a stationary bike. Supplement use for four weeks did not boost fat burning.

Research on carnitine’s role in promoting fat metabolism has been extensively studied, which encourages scientists to keep looking into the substance’s potential.

For instance, supplementing with carnitine for 10 days was discovered to be associated with an increase in fat oxidation in a small study of healthy, slightly overweight people.

According to the study, supplementation may be linked to increased dietary fat consumption, which means that more of the fat ingested was converted to energy. 

Another tiny research found some intriguing findings after giving healthy guys a carnitine pill and a high-carbohydrate beverage for 12 weeks.

The subjects who had the supplement and a carbohydrate beverage twice a day saw a 20% rise in carnitine in their muscles while maintaining their weight.

The control group, on the other hand, had simply the carbohydrate drink twice daily without carnitine and gained an average of roughly 4 pounds.

The supplement group’s lack of weight gain, according to the study’s authors’ theory, was caused by an increase in muscle carnitine.

Benefits of L-Carnitine for weight loss:

  • Your body burns fat more effectively when it has more L-carnitine in it. This reduces the amount of fat your body accumulates as well as visceral abdominal fat, which surrounds your essential organs and may increase your risk of developing fatty liver disease and other major health issues.
  • Your body’s ability to burn fat increases along with your energy level. With the use of L-carnitine, you may boost the quantity of fat burning throughout each workout while also gaining more energy for more effective workouts and an active lifestyle.
  • By incorporating that extra energy into your workouts, you’ll be able to work out harder and speed up your metabolism. Your weight reduction program will benefit greatly from a more effective metabolism since you’ll be able to burn more calories overall, even while at rest.
  • L-carnitine aids in lowering lactic acid accumulation in your muscles. After a vigorous workout, discomfort and muscular exhaustion are caused by the development of muscle lactate. In order to recover more quickly and resume the fat-melting activity that is so important to your weight reduction program, L-carnitine helps clear up the lactate.
  • L-carnitine helps the body’s immune system and serves as a powerful antioxidant in addition to its advantages for fat burning and weight reduction. What connection does this have to your weight-loss plan? Simple: The better you feel, the more likely you are to get dressed for the gym and start exercising.

Side effects of L-carnitine:

  • It may result in adverse reactions including diarrhea, heartburn, upset stomach, and convulsions. It may also result in a “fishy” smell coming from the perspiration, breath, and urine. D- and DL-carnitine should not be used. These carnitine variants may interfere with the effects of L-carnitine and result in symptoms similar to those of a deficit.
  • There isn’t enough trustworthy data to determine if using L-carnitine while pregnant is safe. Avoid usage to be on the safe side.
  • There isn’t enough trustworthy data to determine if using L-carnitine while pregnant is safe. Avoid usage to be on the safe side.
  • When taken by mouth while breastfeeding at the dosages advised by a healthcare professional, L-carnitine may be safe. Infants have received trace levels of L-carnitine in breast milk and formula without experiencing any negative effects. Large doses have unclear consequences.
  • L-carnitine supplementation might exacerbate hypothyroidism symptoms.
  • People with a history of seizures appear to be more susceptible to seizures while taking L-carnitine. Do not take L-carnitine if you recently had a seizure.

The recommended dosage of L-Carnitine:

Depending on your training and body’s needs, the recommended daily intake of l-carnitine is 500 to 2000 mg. Some people may only need 1 gram (1000 mg) of L-carnitine per day, while others may need up to 4 grams (4,000 mg) per day.

Several other forms of l-carnitine, such as acetyl l-carnitine, l-carnitine tartrate, and propionyl l-carnitine, are available for various uses and health advantages.

The one regarded as most helpful for enhancing athletic performance is carnitine tartrate. 1000 mg to 2000 mg per day is the suggested dose. The complete dose, however, can be divided into smaller amounts and taken throughout the day after each meal.


In conclusion, l-carnitine supplementation had a substantial impact on weight, BMI, waist circumference, and fat mass but not body fat percentage in obese and overweight people, indicating that it may have therapeutic applications.

If you’re seeking the right amount of l-carnitine for weight reduction, one strategy is to take a dose of the supplement l-carnitine tartrate after working out and two to three doses of acetyl l-carnitine in between meals.

Along with other fat-burning vitamins, L carnitine can be taken. Taking more l-carnitine during your largest meal of the day is another way to use the supplement to help you lose weight.

Before beginning a regimen, one should always speak with a doctor and a fitness professional to determine the proper dosage of l-carnitine.

Srinidhi, B.Sc. (CBZ)
Srinidhi, B.Sc. (CBZ)

I am a B.Sc. (CBZ) graduate with sound knowledge in health and nutrition. Currently, I am also pursuing my M.Sc. in Bioinformatics.

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