Real Truth About L-Carnitine Weight Loss Injections


If you have tried different techniques and supplements for weight loss, the mention of L- carnitine weight loss injections will not sound strange to you (unless probably you are a newbie doing a first time check on this topic).

So much has been written on the promising effects on L-carnitine on weight loss. A quick goggle search on the topic “L-carnitine weight loss injections” shows over 200,000 results.

Compare this to even a broader search on “L-carnitine for weight loss”. What you get is over 1 million mentions.

l-carnitine search

The mention of this supplemental product is so evergreen that a report  projects  that by 2025, the global L-carnitine market size is expected to reach USD 233.8 million expanding at a CAGR of 4.8%.

l-carnitine market report

L-carnitine –Who to trust?

So many marketers (including some weight loss experts) of this supplement will tell you L-carnitine is the real deal when it comes to losing fat fast.

Many who would do everything to shed weight have been told by different weight loss experts something like“LCarnitine injections is just what you need to help you lose fat fast… we recommend you take LCarnitine injections

Here are just a few examples of what some online weight loss experts and manufacturers say on this supplement…

L-carnitine claims
l-carnitine injection claims
l-carnitine marketing
l-carnitine supplement claims


Sometimes you find marketers of this product who try to be a bit more transparent in terms of promising outright success of real weight reduction as a result of taking this supplement.

A few manufacturers actually do report that that L-carnitine might not work for everyone.

mixed reports on l-carnitine
reports on l-carnitine
explaining mixed results of l-carnitine?

It is no surprise then that Healthline concludes that considering the cellular mechanism of how the supplement works, using L-carnitine as a weight loss supplement makes sense in theory but practically, its effects if present at all — are small.

overall research on l-carnitine

One thing is clear, popular claims about the effectiveness of this supplement for weight loss will not die down any time soon. This article examines what studies have found out about the effect of L-carnitine injections and supplements on weight loss.


Does L-carnitine really help you burn weight fast as some experts make you believe?

What exactly are the findings of researches on the practical effects of L-carnitine on weight loss? Let us analyze some of the research work done to assess to effectiveness of this supplement on weight loss.


Proponents of this supplements will tell you…Not much has been done to prove anything, more research is needed”

True, more research is a welcome idea to shed added light on this topic but many of the available studies indicate negligible effects of l-carnitine on weight loss.

A Study done to investigate the effect of L-Carnitine supplements combined with aerobic training exercise four times per week in moderately obese women showed no significant changes in mean total body mass.

 A similar report this time monitored the effect of L-carnitine supplementation on fat burning during a 90-minute stationary bicycle workout for four weeks. Again, no desired effect. These studies casting doubt on the efficacy of L-carnitine supplementation for weight loss.

Even in some animal studies, the results are no different. One study done on rats did not show a positive effect of L-carnitine supplementation on weight loss and body composition of rat models used.


Actually, there is a research done on cats which indicated that there might be a possibility of weight reduction in these feline animals with L-carnitine.

One major human trials many promoters of L-carnitine cite is a meta‐analysis of studies published in 2016 to study the effect of (L‐)carnitine on weight loss in adults. This systematic review pooled reports of randomized controlled trials on this topic indexed in PubMed, the Cochrane Library and Google scholar from inception to May 2015.

A total of 2,145 studies were retrieved and after much scrutiny and removal of studies that did not meet the needed criteria, nine studies were accepted for final analysis. However, only seven of them were eligible for quantitative analysis. Of the total 911 individuals that participated in the included studies, 449 had received carnitine, and the remaining 462 subjects had been allocated to placebo/control arm.

Results from this study found that carnitine has had a decreasing impact onto weight and BMI in these trials. Positive influence of carnitine onto weight loss was found in chronic conditions such as diabetes and obesity.

Comparing the long term effects of L-carnitine to some of the anti-obesity medications used (orlistat, sibutramine and rimonabant), it was pointed out that although carnitine has a lower magnitude of weight loss than these drugs, unlike them, it does not suffer from some side‐effects such as gastrointestinal issues, rising blood pressure, and pulse rate and increased risk of psychological disorder.

In conclusion, this report shows that people lost an average of 2.9 pounds (1.3 kg) more weight while taking L-carnitine, thus carnitine might be an effective drug for weight loss in adults.


Naturally we all love to hear about things that work don’t we?

We all celebrated these results in humans and it was well cited by many weight loss enthusiasts until after a few months when critics and commentors start picking out valid methodological and practical issues in the study.

This review argued that the following:

  • Of the over 900 identified studies, less than 1% was included.
  • The authors did not present exclusion parameters for the population studied, and there is substantial variability between samples, especially considering diabetic and obese women, diabetic patients, patients with bipolar disorder, diabetic women  and obese women.
  • Analyzing the nine studies included, only four used (l‐)carnitine exclusively. That is, the remaining five in addition to (l‐)carnitine also used other drugs (orlistat and sibutramine) or changes in lifestyle, including exercise and caloric restriction. So, how did they ensure that the effect on body mass was exclusively from (l‐)carnitine, and not from other proposed interventions? 

Thus, it concluded that it seems premature to authoritatively say that ‘carnitine on its own might be an effective drug for weight loss in adults’ without considering the results according to the characteristics of studied participants.



There’s no clear-cut answer to questions related to how much L-carnitine weight loss injections cost. This can vary based on your provider. Reviews estimate the shots ranging from $35 to $75 each.

If you get your shots from a medical or weight loss spa, chances are the shots are part of a weight loss package.

Will you still use it?

It is evident that the cellular mechanism of this supplement suggests that it could have promising results for burning fat and thus weight but results of studies in animal and humans are mixed and indicate that its practical effects if present at all might be small.

We are on the lookout for more studies on this topic especially in younger active ones. This would be much interesting too.

Many who have succeeded in shedding some pounds say it is a result of different methods they tried so the decision is yours to make but if you decide to try it out, remember that you must have a sound diet and exercise plan in place too.

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