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L-Carnitine Coffee for Weight Loss: What the Evidence Shows

By Norma Ector · · Updated

Contents

L-Carnitine is a nutrient that plays an important role in energy production. Your body makes it, and you also get it from foods, mainly red meat and dairy products.

L-Carnitine is marketed as a fat burner because it helps move fat into cells to be burned for energy. In studies, though, supplements lead to only a small amount of extra weight loss.

Coffee contains caffeine, which can make you more alert. Its effect on body weight is small at best.

The purpose of this article is to look at what the evidence says about L Carnitine coffee weight loss claims. We will discuss the role of L-Carnitine in the body, how it affects weight loss, the benefits of coffee for weight loss, and the safety and effectiveness of combining L-Carnitine and coffee for weight loss.

Table of Contents

What is L-Carnitine?

According to Memorial Sloan Kettering Cancer Center, the body makes carnitine from the amino acids lysine and methionine. It is also found in meat and dairy, with smaller amounts in foods like beans and avocado.

Food carnitine is absorbed much better than supplements: about 54% to 87% from food versus 14% to 18% from supplements.

Carnitine's main job is moving long-chain fatty acids into the mitochondria, where they are burned for energy. Healthy people generally make enough on their own.

Supplements are promoted for energy, exercise performance, and fat burning, but the evidence for these uses is mixed.

How L-Carnitine Helps with Weight Loss

l carnitine coffee weight loss

Photo by Annushka Ahuja from Pexels

Because carnitine helps carry fat into mitochondria, it is often assumed that taking more will burn more fat. In practice, the effect is small.

A 2016 meta-analysis of nine randomized trials (911 people) in the journal Obesity Reviews found that people taking carnitine lost about 1.3 kg, or roughly 3 pounds, more than people who did not. The benefit got smaller the longer people took it.

There is no good evidence that carnitine reduces appetite, cravings, or water retention. Diet and physical activity drive far more weight loss than this supplement.

Coffee and Weight Loss

Coffee contains caffeine, which increases alertness. The amount varies by bean and brewing method. The FDA notes that a 12-ounce cup of regular brewed coffee has about 113 to 247 mg of caffeine.

Caffeine can slightly and briefly raise the number of calories you burn, but there is no good evidence that drinking coffee leads to meaningful weight loss. Black coffee has almost no calories, while sugar, syrups, and cream can add a lot.

If coffee helps you swap out a sugary drink, that swap can help. The coffee itself is not a fat burner.

L-Carnitine and Coffee: A Match Made in Weight Loss Heaven?

Not really. We found no studies showing that L-Carnitine coffee, or taking carnitine with coffee, works better than either one alone.

Claims that carnitine counteracts "metabolism-slowing effects of caffeine" are not supported. Caffeine does not slow metabolism.

There is no established dose of L-Carnitine for weight loss. For caffeine, the FDA says up to 400 mg a day is generally not linked to negative effects in healthy adults. That is roughly two to three 12-ounce cups of brewed coffee, not four or five.

Potential Side Effects of L-Carnitine and Coffee

L-Carnitine supplements can cause nausea, heartburn, diarrhea, headache, and, at high doses, body odor. Memorial Sloan Kettering notes that carnitine may increase bleeding risk with blood thinners such as warfarin, and that it can counter the effects of thyroid hormone.

Too much caffeine can cause a fast heart rate, palpitations, insomnia, anxiety, jitters, upset stomach, and headache, according to the FDA. Pregnant people, people with heart rhythm problems, and anyone sensitive to caffeine should limit it.

L-Carnitine and coffee should be used cautiously, as they may interact with certain medications. It is important to speak to a healthcare professional before taking any supplements, as they can provide personalized advice on the safety and effectiveness of combining L-Carnitine and coffee for weight loss.

Best Ways to Incorporate L Carnitine Coffee Weight Loss Routine

If you choose to try a supplement, talk with your doctor first, especially if you take blood thinners or thyroid medication. Supplements are not approved by the FDA for safety or effectiveness before they are sold, so look for products tested by an independent lab.

When drinking coffee during a weight loss plan, skip the sugar, syrups, and heavy cream, which add calories quickly. Caffeine content varies widely by drink, so check labels for pre-made and specialty coffees.

Keep total caffeine at or below about 400 mg a day, and avoid it late in the day if it affects your sleep.

It is also essential to ensure that L-Carnitine and coffee are consumed as part of a healthy diet and lifestyle. This includes eating a balanced diet, exercising regularly, and getting enough sleep.

Success Stories of L-Carnitine and Coffee for Weight Loss

Online testimonials about L-Carnitine coffee are common, but they are not evidence. People who lose weight while using these products are usually also changing their diet and activity.

We could not find any controlled studies of L-Carnitine coffee products. Be skeptical of ads that promise dramatic results or use before-and-after photos.

Critics’ Views on L-Carnitine and Coffee for Weight Loss

The main criticism of carnitine for weight loss is that the benefit is small and fades over time, and long-term studies are lacking.

The main concern with coffee is too much caffeine, which can cause insomnia, anxiety, and a racing heart.

Neither is a shortcut. If you use them, do so with caution and as part of a healthy diet and lifestyle.

Conclusion

L-Carnitine helps the body use fat for energy, but supplements add only about 3 pounds of extra weight loss in studies, and the effect fades. Coffee adds little beyond alertness, and there is no evidence that combining them works better.

If you try either, use caution. Carnitine can interact with blood thinners and thyroid medication, and caffeine should stay at or below about 400 mg a day for most healthy adults.

It is important to remember that L-Carnitine and coffee should be taken as part of a healthy diet and lifestyle. Eating a balanced diet, exercising regularly, and getting enough sleep are all important for achieving successful weight loss results.

References

See the Sources list at the end of this article for the references we used.

FAQs

What is L-Carnitine?

L-Carnitine is a nutrient the body makes from the amino acids lysine and methionine. It helps move fatty acids into mitochondria to be burned for energy, and it is found mainly in meat and dairy, with small amounts in some plant foods.

How does L-Carnitine affect weight loss?

Only modestly. A 2016 meta-analysis of nine trials found people taking carnitine lost about 1.3 kg (roughly 3 pounds) more than controls, and the effect shrank over time. It is not a substitute for diet and exercise.

How does coffee help with weight loss?

Caffeine can slightly and temporarily increase alertness and energy use, but there is no good evidence that drinking coffee leads to meaningful weight loss. Sugar and cream added to coffee can also add calories.

What are the benefits of combining L-Carnitine and coffee for weight loss?

No studies show that combining the two works better than either alone. Claims that L-Carnitine changes how caffeine affects metabolism are not supported.

There is no established L-Carnitine dose for weight loss, so talk with a clinician before taking it. For caffeine, the FDA says up to 400 mg a day is generally not linked to negative effects in healthy adults, roughly two to three 12-ounce cups of brewed coffee.

Sources

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