Updated: 01/15/2018

L-Carnitine Side Effects Review - 5 Things You Need to Know


From time to time, we need to take a closer look at a supplement, like L-carnitine, so we will focus our attention this time on L-carnitine side effects. (We extended an invitation to read our full L-Carnitine review.) We took a deep dive into clinical research and ingredients. We also scrutinized hundreds of consumer comments and reviews. We then condense the info to give you the bottom line.

L-Carnitine Side Effects Readers: Click here to find out why we're giving away samples of our product, Burn HD.

What You Need to Know

L-carnitine is an amino acid derived from methionine and lysine. It occurs naturally in the body and is also found in red meat, pork, chicken, seafood and dairy. The recommended dose depends on the supplement containing L-carnitine. One benefit is that you can find the product in a variety of forms and locations.

The amino acid was first discovered in the early 20th century. Customers can purchase supplements containing L-carnitine on the web and at local retailers. We do like that it is available in everyday foods, but read on…

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Jitteriness – “Really?”

The first issue that concerned us about L-carnitine side effects was jitteriness. “You’d think that something already in the body and found in food wouldn’t cause any problems,” said our Research Editor. “But clearly there is something going on when dieters take more than the body naturally needs.”

“I had uncontrollable anxiety and the jitters after taking this. My heart was racing and I felt like I had drank 20 cups of coffee,” commented a consumer.

“I have had a major uptick in anxiety since then. Really bad yesterday, and still unpleasant today,” reported a dieter.

Nausea – “No Feeling so Great”

Based upon customer comments, one L-carnitine side effects is nausea. “[The] l-carnitine group experienced nausea or diarrhea and consequently did not complete the study,” according to a piece in the Journal of Sport Nutrition and Exercise Metabolism.

“’I’ve recently taken L-Carnitine 2 times a day as instructed with food. I’ve encountered extreme migraines/ nausea after day 4 with a slight fever,” said a customer.

“30 minutes later I got extremely nauseous and my vision became slightly blurred I have 20/20 vision. 10 minutes later…I was still extremely nauseated with an extremely bad headache,” said a customer.

After years of researching products, we’ve found that if there are concerns, like nausea or jitteriness, there’s a chance you won’t experience long-term success. If L-carnitine does in fact cause adverse reactions, the dieter will steer clear.

The Science

There’s mixed reviews relating to the effectiveness of L-carnitine. We did locate studies supporting the claims of efficacy, but according to the Annuls of Nutrition and Metabolism, studies, “did not show a positive effect of L-carnitine supplementation on weight loss and body composition”. At DietSpotlight, finding scientific research supporting promises is a big piece of the puzzle. If companies can’t provide the research, there’s a problem.

The Bottom Line

After taking a closer look at L-carnitine, here’s our verdict. We like that the amino acid is readily available, but we can’t recommend it because the research isn’t conclusive on the topic of weight-loss. Plus, we’re concerned about the side effects reported by users. 

If you want to drop the weight, we suggest a supplement with no reported side effects, that’s backed by published clinical research.

Dietspotlight Burn is among the best supplement we’ve reviewed this year. The product contains a formula consisting of a four-ingredient proprietary blend, which has been shown in studies to promote fat loss and ignite metabolism. We’ve not heard anyone talking about negative side effects and reviews on the web show people are seeing exceptional results.

Also, the company behind Dietspotlight Burn is offering a special trial offer as a sign of confidence in the supplement, impressive.

Learn More About Burn HD »
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L-Carnitine Side Effects

What are the ingredients in l Carnitine?

L Carnitine has many different names. It can be called N-trimethyl-1-propanaminium inner salt, 3-hydroxy-4-N-trimethylaminobutyrate, and N. L Carnitine is an amino acid naturally synthesized in the human body. In common household everyday foods like chicken, pork, and red meat all contain L Carnitine naturally. This amino acid produces energy in the body.

What are the side effects of l Carnitine?

Some consumers report a L Carnitine side effect of muscle tension or jitteriness. Nausea has been reported a side effect as well.

How do I know if L-Carnitine Side Effects is right for me?

Choosing the right product is the #1 question asked by DietSpotlight readers. We recommend trying any product before buying it and know that finding a product with a sample offer is near impossible - so we created our own product, Burn HD, with scientifically backed ingredients.

Click here to get your sample of our powerful fat burner today.

Does l Carnitine work?

L Carnitine does give the body energy, it is scientifically proven. It has not been linked to weight loss, which is what it is the common marketing message for this supplement.

What is the price of l Carnitine?

The average price among different companies producing L Carnitine is $10 for a container. The more purchased at one time, the less each serving will cost.

Where can I buy l Carnitine?

You can buy L Carnitine at most department stores, vitamin stores, and online retailers.

How should I take l Carnitine?

Take one serving, liquid or tablet, a day.

How do I contact l Carnitine customer service?

You can contact the manufacturer of the product purchased from the number located on the product’s packaging.

Can I return l Carnitine?

A seller’s or marketplace’s terms of service determine the ability of a customer to return an item.

What are the most common complaints about l Carnitine?

The most common complaints are about the reported side effects. The Nausea side effect reported made customers never feel 100 percent when they worked out. The jittery impact made customers feel insecure because they knew they were acting strange around their friend and colleagues at work.

Summer Banks Dietspotlight Author
About the Author:

Summer Banks, Director of Content at Dietspotlight, has researched over 5000 weight-loss programs, pills, shakes and diet plans. Previously, she managed 15 supplement brands, worked with doctors specializing in weight loss and completed coursework in nutrition at Stanford University. full bio.

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