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Top 11 Best L-Carnitine Supplements

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Written by Andrew Le, MD.
Medically reviewed by
Last updated August 24, 2024

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L-Carnitine is a popular supplement taken by sports persons, bodybuilders, and physique-conscious people to boost performance and have a leaner body. This is a non-essential amino acid that helps transport fatty acids into mitochondria for use as energy substrates. L-Carnitine is available in capsules, tablets, liquids, and powders but the most preferred type is the L-Carnitine powder.

In order to determine which L-Carnitine supplements are the best in terms of quality/purity and effectiveness, we devoted a lot of time to conducting research and experimenting. In the subsequent section, we will review our favorite L-Carnitine powder supplements that are available for purchase.

Top 3 Best L-Carnitine Supplements

  1. Momentous Acetyl-Carnitine, 60 Servings
  2. Nutricost L-Carnitine Tartrate 1000mg
  3. Healthycell AM/PM Nutrition

Are you interested in using an effective natural remedy to enhance your energy and athletic performance? L-carnitine supplements may be what you are looking for. L-carnitine is an amino acid that involves itself in the process of fatty acids being transported into the mitochondria to be oxidized for energy. This may lead to increased endurance, reductions in the time taken for muscle recovery, and thus better fat loss.

Since there is a wide variety of L-carnitine supplements available in stores it can be quite challenging to decide which of them is worthy of your time and money. That is why we have compiled this list of the top L-carnitine supplements that can be found at the moment. You can now trust that these products work, are safe, and are of the highest quality because we have done the research and tests for you. Take a look at our selection of superior products listed below.

Momentous Acetyl-Carnitine, 60 Servings

The Editor's Choice

Discover tranquility and cognitive support in the convenient capsule form of Momentous L-Theanine. Ideal for hectic lifestyles, it offers potential cognitive enhancement and relaxation. Manage expectations as individual responses vary; consistent use is key. Consult a healthcare professional, especially if you have health conditions or take other medications.

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If you are interested in buying an L-Theanine supplement, Momentous L-Theanine Capsules with 60 servings may be of interest to you. These capsules are specially formulated to provide easy dosing of L-Theanine so that you can easily incorporate it into your daily regimen.

Pros

  • Enhanced Cognitive Function: Momentous L-Theanine Capsules are designed to promote improved cognitive function, providing a potential boost to focus and concentration.
  • Calming Effect: L-Theanine is known for its ability to induce a sense of calm and relaxation without causing drowsiness. This can be particularly beneficial for individuals dealing with stress or seeking a supplement to support a balanced mood.
  • Convenient Capsule Form: The encapsulated form of L-Theanine in these servings ensures a hassle-free and precise intake, eliminating the need for measuring powders or dealing with liquid forms.

Cons

  • Not a Quick Fix: While L-Theanine may offer various benefits, users should be aware that noticeable effects may take some time to manifest. Immediate or dramatic results should not be expected.
  • Potential Individual Variation: Responses to L-Theanine can vary from person to person, and some individuals may not experience the desired effects.
  • Not a Substitute for Medical Advice: It's crucial to emphasize that L-Theanine, like any supplement, is not a substitute for professional medical advice or treatment. Individuals with specific health concerns should consult with a healthcare professional before incorporating this supplement into their routine.

The viability of Momentous L-Theanine in capsule form makes it an appealing option for users who need mentation and soothing. This is because the ability to improve mental performance and relaxation can be useful for people with busy schedules or those who work under pressure.

Nevertheless, it is crucial to look at the caveats, acknowledge that the reaction might be different and offer it’s use on a regular basis might be needed to see the positive outcomes. Like most supplements, it is wise to seek the advice of a doctor, especially if one is suffering from a disease or taking other medicines.

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The Nutricost L-Carnitine Tartrate 1,000mg is a great product if you are looking for a high quality L-Carnitine supplement. We highly recommend this product due to its efficiency and the reasonably cheap price.

Pros

  • Each capsule contains 500mg of L-Carnitine Tartrate, making it easy to get the recommended daily dose.
  • With 240 capsules per bottle, you'll have a 4-month supply of L-Carnitine.
  • Nutricost L-Carnitine Tartrate is free from harmful additives, non-GMO, and gluten-free.

Cons

  • Some users may experience a fishy aftertaste or odor.
  • The capsules may be difficult to swallow for some people.
  • The effects may take some time to become noticeable.

We have now been using the Nutricost L-Carnitine Tartrate for a few weeks and we feel that the effects are quite remarkable. We have observed that during workouts, we have much more energy and do not get tired quickly – in other words, our engines seem to have been tuned up.

Another aspect that we have come to appreciate in this product is that it is crafted from excellent ingredients and produced in a facility that is GMP approved and recognized by the FDA. We also like that it is made without any sort of added chemicals and ingredients that have been known to cause side-effects such as gluten.

The only problem we have encountered is that they have a somewhat fishy taste when they are cooked not to perfection, but this is something we do not mind. In summary, by arresting and analyzing Nutricost L-Carnitine Tartrate, we believe it to be a very effective supplement for boosting athletic performance and metabolism.

Order Healthycell AM/PM Nutrition Now!

This supplement promises to boost energy, support metabolism, and enhance overall wellness while fitting seamlessly into daily routines.

Pros:

  • Comprehensive Formula: Combines L-Carnitine with a wide range of essential nutrients.
  • Day and Night Support: AM/PM packets ensure we get targeted support around the clock.
  • Convenience: Easy-to-take packets simplify our supplement routine.

Cons:

  • Price Point: Slightly higher compared to other L-Carnitine supplements.
  • Taste: The flavor of the powder might not be for everyone.

Healthycell AM/PM Nutrition is designed with two separate formulas for daytime and nighttime use. The AM formula is packed with L-Carnitine, B vitamins, and antioxidants to help boost energy and focus throughout the day. The PM formula includes additional ingredients to support relaxation and recovery, ensuring we wind down effectively for restful sleep. Each packet is individually sealed, making it easy to carry and use.

After incorporating Healthycell AM/PM Nutrition into our routine, we noticed a marked improvement in our energy levels and overall vitality. L-carnitine helps enhance our metabolism, while the comprehensive blend of nutrients provides a balanced approach to daily wellness. The convenience of the AM/PM packets ensured we were well-supported both day and night.

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Force Factor Liquid L-Carnitine 3000 mg stands out as one of the best L-carnitine supplements on the market. We chose it to help improve our workout performance and enhance muscle recovery.

Pros:

  • 3000 mg of L-Carnitine per serving
  • Effective in boosting energy and muscle recovery
  • Tasty berry flavor
  • Non-GMO and maximum strength

Cons:

  • Liquid form may not suit everyone's preference
  • Slightly expensive for regular use

Force Factor Liquid L-Carnitine contains 3000 mg of L-Carnitine per serving, providing maximum strength to help convert fat into energy more efficiently. This non-GMO formula is flavored with a delicious berry taste, which makes it enjoyable to take. Additionally, the liquid form ensures faster absorption, and the 16 oz bottle provides a sufficient supply for consistent use. Its clean ingredient profile is perfect for those who prefer a supplement free from unnecessary additives.

We've noticed a significant boost in our cellular energy levels since incorporating Force Factor L-Carnitine into our regimen. Our workouts feel more efficient, and our muscle recovery time has noticeably shortened. It's been especially beneficial on cardio days, helping us power through longer sessions without feeling drained. While the price might be a bit higher than some alternatives, the results make it a worthwhile investment for those serious about their fitness goals.

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If you are interested in getting a highly potent L-Carnitine supplement product, then NaturaLife Labs Acetyl L-Carnitine 1,500 mg could be the best for you to try. We believe that this product is one of the most potent, high-quality and containing only the finest ingredients.

Pros

  • The most potent formula available on the market with 1500 mg per serving
  • Made with 100% pure Acetyl L-Carnitine without the use of fillers or binders
  • Manufactured in an FDA registered facility in accordance with Good Manufacturing Practices (GMP)

Cons

  • Common side effects like stomach upset, nausea, and dry mouth may occur if serving is not taken with a meal and adequate amount of water
  • Some customers have reported that it keeps them awake at night
  • Only 100 capsules per bottle

We should note that we have tasted NaturaLife Labs Acetyl L-Carnitine 1,500 mg for ourselves and we were impressed with its performance on our body energy levels and focus. The capsules are particularly small and easy to swallow; the product received had not been affected by the malevolent forces of time.

If you want a natural supplement that enhances energy production and brain function, you should try NaturaLife Labs Acetyl L-Carnitine 1,500 mg. However, to reduce the risk of side effects it is recommended to take it with a meal and enough water.

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If you are shopping for an L-Carnitine supplement that contains a very high dosage, then NOW Supplements Acetyl-L Carnitine 500 mg could be worth considering.

Pros

  • Boosts cellular energy
  • Supports mitochondrial function
  • Kosher and Non-GMO certified

Cons

  • Product may melt/damage if exposed to heat or sunlight
  • May have side effects, consult a doctor before use
  • May not work for everyone

NOW Supplements Acetyl-L Carnitine 500 mg is truly remarkable and we’ve been using it for a few weeks now. We have seen the positive impact it has made on our energy levels, especially during activities such as exercise. The supplement is also very convenient to consume since it does not leave a bad taste in the mouth or has any side effects.

Also important to note is that the product is sensitive to heat and sunlight and may melt if exposed to this therefore should be stored carefully. It is also necessary to say that though the supplement seems useful to us, it may be ineffective for other people.

In summary, Nutricost Acetyl-L Carnitine 500 mg is a good L-Carnitine supplement for one who needs a product to boost their energy and keenness.

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Take your workout and metabolism up a notch with DR. MARTIN’S NUTRITION Extra Strength L-Carnitine – 200 cont labels.

Pros

  • Provides a massive 200 capsules with each capsule size of 500mg each.
  • Enhances mental focus and alertness by increasing memory related functions.
  • Can support in increasing oxygen supply to the muscles.

Cons

  • Pretty potent bad smell and taste.
  • Wish they had samples first to see if you don't get a reacting before purchase.
  • Have not noticed any improvement as yet.

We have been utilizing DR. MARTIN’S NUTRITION L-Carnitine for the past few weeks, and I must say that we have felt a boost in energy. The capsules are smooth and round to swallow without any problem and we note that the bottle contained two hundred capsules which last for 2 months.

We’ve felt more energized and yet we’ve gotten a stinking smell and taste in our mouth when consuming the capsules. Moreover, we would have preferred if there were samples produced for use before the customers because not everyone might have a good reaction to the supplement.

In conclusion, you may want to consider using Extra Strength L-Carnitine to enhance extra energy to enable you to perform better.

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If you are on the lookout for a fat burner supplement that does not contain any stimulants and will help convert body fat to a usable source of energy, then Pro Supps L-carnitine Liquid Fat Burner Stimulant Free Metabolic Enhancer is a product you should consider. When it comes to the varieties, there are 7 different tastes or flavors to select from to provide you with the best taste that you desire.

Pros

  • ProSupps is committed to providing products that contain the most effective, 3rd party tested, and safe ingredients.
  • ProSupps L-Carnitine has been shown in studies to support fat loss, making it a powerful, stimulant-free fat burner supplement for men and women.
  • ProSupps offers a 30-day, 100% satisfaction guarantee.

Cons

  • During the summer months, products may arrive warm but Amazon stores and ships products in accordance with manufacturers' recommendations, when provided.
  • The lid might leak and cause a mess.
  • The price is higher compared to other L-carnitine supplements.

We have been taking Pro Supps L-carnitine Liquid Fat Burner Stimulant Free Metabolic Enhancer for some time now, and the product is quite effective. It is sweet and tasty, and you can easily chew it before exercising with the aid of the sour watermelon candy flavor. We have observed more vigor in training and more perspiration during cardio activities.

It is very simple and convenient to use, and the product is free of stimulants means we can take it at any time of the day without the side effects of feeling jittery or sleepy. We also understand that the company has the goal of creating and selling healthy and safe supplements as a key value proposition.

All in all, if you want a well-tasting fat burner supplement that doesn’t contain stimulants and does its job then Pro Supps L-carnitine Liquid Fat Burner Stimulant Free Metabolic Enhancer is another supplement to consider.

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We highly suggest the L-Carnitine LS3- Grape supplement for the improvement in sports performance and the general body makeup of any individual.

Pros

  • The supplement delivers 1500mg of Advanced L-Carnitine Complex per serving.
  • It assists in the processing of fatty acids, which supports improved energy.
  • The combination of L-Carnitine, Acetyl-L-Carnitine, and L-Carnitine L-Tartrate is backed by science.

Cons

  • The taste may be too strong for some users.
  • It may not work for everyone.
  • The results may take time to become noticeable.

L-Carnitine LS3 – Grape has been personally tested by us and its effectiveness is proven through its capability of enhancing energy and body profile. The supplement is calorie-free, sugar-free, and contains no gluten which is perfect for people who are on a diet.

Another advantage is that the supplement is flexible and can be taken together with a workout program or a healthy diet leading to enhanced results. It helps increase energy production hence the perfect supplement for anybody involved in vigorous exercises.

In conclusion, we believe that the iSatori L-Carnitine LS3 – Grape supplement is worth purchasing, especially for those who desire to enhance their athletic performance and body makeup. It contains great taste and the product is developed with a scientific formula which makes it a recommended supplement.

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If you are interested in a potent and non-stimulant product that can help in building muscles during training, then you need to consider the PROSUPPS® L-Carnitine 1500 Liquid.

Pros

  • Comes in 8 amazing flavors that can satisfy every palate.
  • Committed to quality, with 3rd party tested and safe ingredients.
  • 100% satisfaction guaranteed with a 30-day money-back guarantee.

Cons

  • Packaging may vary.
  • Some users may not like the taste.
  • Some users may not see significant results.

We have personally tasted Cherry Popsicle indeed and it is fantastic. It is not very sweet and this made me gain a lot of energy without having any side effects of taking sugar. It can be used to apply directly on its bottle, and it has been confirmed to provide good muscle gains during exercises.

Another great feature of PROSUPPS® L-Carnitine 1500 Liquid is the fact that one gets to enjoy it in 8 delicious flavors. It comes in Berry, Blue Razz, Green Apple, Sweet-N-Tart, Cherry Popsicle, Sour Watermelon, Orange Sherbet, and Dragon Fruit. This helps you to get that particular flavor that you will prefer the most.

We also understand that PROSUPPS has embraced the provision of the best products with the right ingredients in the market. All their products are of high quality and all their products are produced in factories that adhere to cGMP. This helps in eliminating fake products from the market that may pose a threat to the lives of consumers.

PROSUPPS® L-Carnitine 1500 Liquid has also been backed with a 30-day 100% satisfaction guarantee. This implies that if the customer does not find the product suitable, he or she can return the product for a full refund.

In conclusion, if you are in need of a potent and stimulant-free supplement that assists in muscle maintenance during a training regimen then PROSUPPS® L-Carnitine 1500 Liquid will suit you well. It is available in 8 great flavors, is quality-conscious, and is backed with 30-day money-back guarantee.

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NOW L-Carnitine 1,000 mg Tablets are clinically tested, vegetarian, and provide you with a 100% pure L-Carnitine-based supplement. It also plays a role in overall well-being by enhancing the translocation of fatty acid groups to the membrane of mitochondria for conversion into cellular energy.

Pros

  • Boosts cellular energy and transports fatty acids
  • Offers fitness support
  • Non-GMO, Kosher, Soy Free, Vegan/Vegetarian

Cons

  • Large tablet size may be difficult to swallow
  • Natural color variation may occur
  • May take some time to see results

For the past few weeks, we have been taking NOW L-Carnitine 1,000 mg Tablets and we have experienced a positive change in energy during exercise. We also note that it is vegan and does not contain any soy and genetically modified organisms. The only issue is that the tablet size is relatively large, and it may not be easy to swallow it whole.

All in all, if you are in need of an L-Carnitine supplement that is thoroughly vegetarian and tests positive for fitness, then you should consider the NOW L-Carnitine 1,000 mg Tablets.

Buying Guide

When choosing the best L-carnitine supplement, there are several factors to consider. We recommend looking for products that meet the following criteria:

Form of L-Carnitine

There are several forms of L-carnitine, including L-carnitine tartrate, acetyl-L-carnitine, and propionyl-L-carnitine. Each form is different and has its advantages for supplementation and the way that they are utilized in the body. For instance, L-carnitine tartrate is beneficial to physical performance and exercise while Acetyl-L-carnitine is helpful in enhancing brain performance. Take into account your particular necessities and ensure that you take a specific form of L-carnitine that will meet your needs.

Dosage

It is necessary to point out that the daily dosage of L-carnitine may significantly differ depending on the specific product. This means that one needs to select a supplement that will deliver the optimal amount of L-carnitine without going over the safe levels. The recommended daily intake of L-carnitine is generally between 500-2000mg, depending on the type of L-carnitine used. Always check the instructions on the packaging and speak to your doctor if you are in any doubt about the correct volume for you to administer.

Purity and Quality

When it comes to picking the right L-carnitine supplement, it’s important to make sure the supplement does not contain any unwanted substances. Search for products that have passed through a third-party testing and certification process for quality and purity. Besides, it is vital to pay attention to the source of L-carnitine before deciding to incorporate the supplement into your diet. While some supplements contain synthetic L-carnitine, there are those that are sourced naturally. It has been observed that protein derived from natural sources like red meat and dairy products is more bio-available and efficient.

Other Ingredients

L-carnitine supplements often contain other substances like caffeine or green tea extract to boost the effects of L-carnitine. Nonetheless, it is crucial to note any possible interactions or adverse effects that the listed ingredients may cause. Always take a look at the list of ingredients, and if you have any questions, contact the doctor.

In summary, the above analysis suggests that the decision of the best L-carnitine supplement involves several considerations. If you are willing to dedicate some time and effort to details and different comparisons, you are likely to find a supplement that is perfect to meet your required wants and needs.

Frequently Asked Questions

What are the benefits of taking L-carnitine supplements?

L-carnitine supplements can be quite helpful for various purposes, including increased energy, better working capacity during exercises and exercises, and better fat breakdown. Another benefit entails its functions in alleviating muscle cramps, and pains, enhancing heart and brain functions.

What is the recommended dosage for L-carnitine supplements?

The suggested intake of L-carnitine depends on the specific type of supplement, and the dosage may also be affected by several factors. It is advisable for an average user to take about 500-2000mg per day. However, it is advised to read the label of the product and seek advice from a healthcare provider before incorporating any new supplements into the diet.

Which form of L-carnitine supplement is most effective?

There are several forms of L-carnitine supplements available, including L-carnitine tartrate, acetyl-L-carnitine, and propionyl-L-carnitine. Each form has its own unique benefits and may be more effective for certain uses. However, L-carnitine tartrate is the most commonly used form and has been extensively studied for its benefits on exercise performance and fat metabolism.

Are there any side effects of taking L-carnitine supplements?

L-carnitine supplements are generally safe for most people when taken in recommended doses. However, some people may experience mild side effects such as nausea, diarrhea, or stomach discomfort. In rare cases, high doses of L-carnitine supplements may cause more serious side effects such as seizures or heart palpitations.

Can L-carnitine supplements help with weight loss?

L-carnitine supplements may help support weight loss by improving fat metabolism and increasing energy levels. However, they should not be relied upon as a sole method for weight loss and should be used in conjunction with a healthy diet and exercise regimen.

Are there any specific brands of L-carnitine supplements that are recommended?

Today, numerous excellent quality L-carnitine supplements are produced by various brands. Among other commonly used and rated brands, we have NOW Foods, Jarrow Formulas, and Optimum Nutrition. Nevertheless, it is advisable to carry out your own investigation and opt for the brand which you find most suitable for yourself.

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Jeff brings to Buoy over 20 years of clinical experience as a physician assistant in urgent care and internal medicine. He also has extensive experience in healthcare administration, most recently as developer and director of an urgent care center. While completing his doctorate in Health Sciences at A.T. Still University, Jeff studied population health, healthcare systems, and evidence-based medi...
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