L-carnitine is an amino acid compound used as a supplement to improve mitochondrial health and act as a bioenergetic. In plain English, that means it improves energy levels by boosting the action of the mitochondria -- the energy powerhouse in your cells.
L-carnitine has a range of sub-compounds that can have a variety of different effects. The supplement may help improve cognition and aid in recovery. It also acts as a nitric-oxide-boosting ingredient that may improve your workouts.
Uses
Carnitine acts as an antioxidant, making it a possible treatment for a variety of different health problems. Antioxidants help eliminate free radicals, which damage cells and can alter DNA. Experts theorize that since antioxidants neutralize free radicals, L-carnitine may reduce or prevent health problems.[4]
How it works
L-carnitine works by making it easier for the body, specifically the mitochondria in your cells, to produce more energy. This leads to improved endurance, which in turn may yield better performance at the gym and increased overall activity.
This amino acid does have a relatively low bioavailability, however, with just about 15% staying intact. The remaining useable form will pass through your digestive system. Despite its low absorption rate, L-carnitine and its sub-compounds still provide several benefits.
L-carnitine sub-compounds
In the body, L-carnitine is converted into a variety of related compounds. Each has different benefits. While you could supplement with a broad-range L-carnitine supplement, read about the specific benefits provided by sub-compounds, like acetyl L-carnitine, propionyl L-carnitine, and L-carnitine L-tartrate.
Acetyl L-carnitine
Acetyl L-carnitine, or ALCAR, acts as a neurotransmitter and can help with problems related to aging, especially brain cognition.[1] The energy-boosting effect of ALCAR also promotes endurance and increases alertness, though the effect is not as strong as caffeine.
ALCAR is recommended for offsetting the effects of chronic fatigue, metabolic disorders, and dementia.
Endurance athletes considering l-carnitine supplementation should skip right to ALCAR. The fatigue-fighting effects (which are discussed in depth on our acetyl l-carnitine page) are well worth their price, especially when considering the focus boost that comes along with it.
Propionyl-L-carnitine
Propionyl-L-carnitine, or PLCAR, is estimated to have a somewhat higher bioavailability than standard L-carnitine, but no studies quantify how much. It also has fewer side effects than other L-carnitine sub-compounds.
Propionyl-L-carnitine increases energy production in the muscle by converting fatty acids to acylcarnitines, which are burned as energy, resulting in weight loss.[2] This process allows you to retain lean muscle mass since the body only burns fat, not muscle. You should note, however, that studies on weight loss using propionyl-L-carnitine has only been studied on mice, not humans.
L-carnitine L-tartrate
L-carnitine L-tartrate, or LCLT, is a great supplement for recovery following a workout. Supplemental LCLT acts as an antioxidant, lowering free radical production, and can reduce soreness after exercise. In one small study, researchers demonstrated that using 2g of LCLT daily reduced muscle disruption following exercise up to 45% faster compared to a placebo group.[3]
Glycine propionyl-L-carnitine
To help build endurance and get the most out of your workout, glycine propionyl-L-carnitine (GPLC) is extremely beneficial. It helps promote nitric oxide in your body, which in turn acts as a vasodilator. In plain language, it increases blood flow and oxygen supplied to your muscles.
Forms
Standard L-carnitine is the most widely available and least expensive of all the carnitine compounds. Each are available in liquid, powder, and capsules. Liquid forms provide faster uptake and more of the compound can be absorbed. However, liquid, as well as powders, can have a bitter aftertaste, making the pill form more appealing to some.
Recommended dosage
The recommended dosage range for supplements in the L-carnitine family are as follows:
| L-Carnitine Compound | Recommended Dosage (mg p/d) | Recommended Dosage (g p/d) |
|---|---|---|
| Standard | 1,000mg to 3,000mg | 1g to 3g |
| ALCAR | 630mg to 2,500mg | .63g to 2.5g |
| PLCAR | 500mg to 2,000mg | .5g to 2.g |
| LCLT | 1,000mg to 4,000mg | 1g to 4g |
| GPLC | 1,000mg to 4,000mg | 1g to 4g |
According to the University of Maryland Medical Center, a typical dose for standard L-carnitine is between 1g to 3g per day.[4]
Who should take it
It's hard to imagine a group that this supplement would put at a disadvantage. By helping you stay active or improving your performance, it's an excellent supplement for anyone interested in healthy living. It's especially beneficial if you suffer from chronic fatigue or age-related neurological problems.
Considerations
In 2011, researchers from Maryland's Institute of Chronic Illnesses concluded that L-carnitine therapy, administered at 50mg/kg of bodyweight per day for three months, demonstrated significant improvement in clinical measurements of autism spectrum disorder severity. More studies are needed to confirm these results and move towards autism treatment methods using this amino acid.[7]
L-carnitine misconceptions
Although its supplementation is popular for weight loss, standard l-carnitine is not shown to burn fat — even when combined with aerobic activity.[5] Due to the lack of fat burning effects, we consider this a third-tier supplement for most individuals, and typically recommend one of the sub-compounds, such as acetyl-l-carnitine. In 2005, Swiss exercise physiology experts demonstrated that the compound does not improve recovery from fatigue-inducing workouts.[6]
According to the University of Maryland Medical Center, L-carnitine is safe for use in combating fatigue and improving exercise performance, "but may not help much."[4]
Potential side effects
Taking too much L-carnitine, about 5g, can cause digestive upset, abdominal pain, vomiting, and diarrhea, though these symptoms cease once you lower your dosage (start by cutting it in half), or stop taking it completely. Another good idea is to switch to a sub-compound such as ALCAR, which requires you to take less, and may yield fewer problems.
Other side effects include rash, body odor, and increased appetite, though these are rare.[4]
Warnings
As with any medication or supplement, talk to your doctor before changing or adding to your fitness regimen. If you have any of the following disorders, delay any type of carnitine supplementation until you consult with a physician:[4]
By helping you stay active and improving your performance, L-carnitine is an excellent supplement for anyone interested in healthy living.
- Peripheral vascular disease
- High blood pressure
- Liver disease from alcoholism (cirrhosis)
- Diabetes
- Kidney disease
- History of seizures
Food sources
Red meat is the best way of supplementing L-carnitine through diet. It contains 95mg of the amino acid per 100g of beef. That means to get the lowest effective dosage of L-carnitine, at 500mg, you would need to eat more than 526g, or 18.56 oz., of steak every day. If the cost of a 20oz. daily rib eye habit doesn't dissuade you, the possible damage to your arteries and inevitable weight gain should.
Recommended brands
We suggest the following brands for liquid and powder L-carnitine formulations:
- NOW Foods has an excellent powdered or capsule L-carnitine supplement in a variety of sizes.
- Dymatize offers a sugar- and calorie-free liquid L-carnitine that is very affordable. Where to buy
References
- Goo MJ, et. al.; Archives of Pharmacal Research; "Protective effects of acetyl-L-carnitine on neurodegenerative changes in chronic cerebral ischemia models and learning-memory impairment in aged rats;" January 2012
- Mingorance C, et. al.; PLoS One; "Propionyl-L-carnitine corrects metabolic and cardiovascular alterations in diet-induced obese mice and improves liver respiratory chain activity;" March 2012
- Volek JS, et. al.; American Journal of Physiology; "L-Carnitine L-tartrate supplementation favorably affects markers of recovery from exercise stress;" February 2002
- University of Maryland Medical Center; "Carnitine (L-carnitine);" Reviewed March 2011
- Villani RG, et. al.; International Journal of Sports Nutrition and Exercise Metabolism; "L-Carnitine supplementation combined with aerobic training does not promote weight loss in moderately obese women;" June 2000
- Stuessi, C, et. al.; European Journal of Applied Physiology; "L -Carnitine and the recovery from exhaustive endurance exercise: a randomised, double-blind, placebo-controlled trial;" December 2005
- Geier DA, et. al.; Medical Science Monitor; "A prospective double-blind, randomized clinical trial of levocarnitine to treat autism spectrum disorders;" June 2011
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L-Carnitine Price Alerts
The following price alerts are still active:
- Jul 11, 2025Nutrex L-Carnitine 3000 16 Oz. (only Sour Gummy Worms) dropped by 25% to $17.99 at Best Price Nutrition
- Jul 11, 2025Nutricost L-Carnitine Tartrate 250 Grams dropped by 12.2% to $19.16 at Amazon
- Jul 11, 2025Nutricost L-Carnitine Tartrate 120 Capsules dropped by 15.8% to $11.96 at Walmart
- Jul 11, 2025Nutricost Acetyl L-Carnitine 250 Grams dropped by 15.8% to $23.96 at Amazon
- Jul 10, 2025Jarrow Formulas L-Carnitine 50 Vcaps dropped by 35% to $4.23 at Amazon
- Jul 10, 2025Alpha Lion SuperHuman Scorch 31 Servings (only Grapezilla (Grape Bubblegum)) dropped by 13.8% to $43.11 at Walmart
- Jul 09, 2025Designs For Health Carnitine Synergy 120 Vcaps dropped by 20% to $67.99 at Amazon
- Jul 09, 2025Rich Piana 5% Nutrition Liquid L-Carnitine 3150 32 Servings (only Mandarin Orange) dropped by 11.8% to $23.24 at Amazon
- Jul 09, 2025Evogen Carnigen Premium Liquid 16 Oz. dropped by 25% to $26.24 at Amazon
- Jul 09, 2025Bucked Up L-Carnitine Tartrate 300 Grams dropped by 19.9% to $23.96 at Amazon
- Jul 09, 2025Bucked Up essentials - Acetyl L-Carnitine 120 Capsules dropped by 30% to $11.87 at Amazon
- Jul 09, 2025Inno Supps Volcarn 2000 32 Servings (only Lemon Lime, Rainbow Sherbet, Tropical Blast) dropped by 20% to $26.39 at Amazon
- Jul 09, 2025Dragon Pharma L-Carnitine 3000 32 Servings (only Sour Watermelon) dropped by 20% to $30.39 at Amazon
- Jul 09, 2025Force Factor L-Carnitine 90 Tablets dropped by 11.1% to $15.99 at Amazon
- Jul 09, 2025VMI Sports L-Carnitine 3000 31 Servings (only Cherry Lime) dropped by 6.7% to $27.99 at Amazon
- Jul 09, 2025GNC Acetyl-L-Carnitine 60 Capsules dropped by 35.9% to $12.74 at GNC
- Jul 09, 2025Force Factor L-Carnitine 16 Oz. dropped by 10.6% to $16.09 at Amazon
- Jul 09, 2025GNC Acetyl-L-Carnitine Alpha Lipoic Acid 60 Capsules dropped by 33.3% to $15.29 at GNC
- Jul 09, 2025Performix SST Support Burn - L-Carnitine 31 Servings dropped by 20.7% to $23.79 at Amazon
- Jul 09, 2025Ronnie Coleman L-Carnitine XS 4000 16 Oz. (only Grape Nectar) dropped by 20% to $26.39 at Amazon
- Jul 08, 2025Designs For Health Acetyl L-Carnitine 90 Vcaps dropped by 20% to $38.39 at Amazon
- Jul 08, 2025Nutricost L-Carnitine Tartrate 240 Capsules dropped by 20% to $15.96 at Walmart
- Jul 08, 2025Swanson L-Carnitine 100 Tablets dropped by 34.4% to $10.82 at iHerb.com
- Jul 08, 2025VMI Sports L-Carnitine 3000 31 Servings (only Miami Vice) dropped by 8.2% to $22.03 at iHerb.com
- Jul 08, 2025Ronnie Coleman L-Carnitine XS 4000 16 Oz. (only Apple Bomb, Cherry Rush, Rainbow Candy) dropped by 20% to $26.39 at Amazon
- Jul 08, 2025VMI Sports L-Carnitine 3000 31 Servings (only Sour Candy, Strawberry Kiwi) dropped by 6.7% to $27.99 at Amazon
- Jul 08, 2025Momentous Acetyl L-Carnitine 60 Capsules dropped by 20% to $21.56 at Amazon
- Jul 07, 2025Nutrex Lipo-6 Carnitine 120 Capsules (only Powder) dropped by 6.7% to $27.99 at Muscle and Strength
- Jul 07, 2025The Vitamin Shoppe L-Carnitine 16 Oz. dropped by 20% to $19.99 at Amazon
- Jul 07, 2025The Vitamin Shoppe Acetyl-L-Carnitine 60 Capsules dropped by 20% to $22.39 at Amazon
- Jul 06, 2025Swanson L-Carnitine Fumarate 60 Capsules (only 415mg) dropped by 20% to $18.15 at iHerb.com
- Jul 04, 2025Force Factor Acetyl L-Carnitine 100 Vcaps dropped by 50% to $7.12 at iHerb.com
- Jul 03, 2025Ronnie Coleman L-Carnitine XS 3000 16 Oz. (only Blue Razz) dropped by 20% to $20.51 at iHerb.com
- Jul 01, 2025The Vitamin Shoppe Acetyl-L-Carnitine 240 Capsules dropped by 20.7% to $32.49 at Vitamin Shoppe
- Jul 01, 2025The Vitamin Shoppe Acetyl-L-Carnitine 120 Capsules dropped by 47.4% to $21.49 at Vitamin Shoppe
- Jun 30, 2025Nutrex L-Carnitine 3000 16 Oz. (only Berry Blast) dropped by 9% to $9.99 at Muscle and Strength
- Jun 30, 2025Nutrex L-Carnitine 3000 16 Oz. (only Lunar Pop) dropped by 50% to $9.99 at Muscle and Strength
- Jun 30, 2025Doctor's Best Acetyl-L-Carnitine 60 Vcaps dropped by 28.3% to $7.87 at AllStarHealth
- Jun 25, 2025NOW Acetyl L-Carnitine 100 Vcaps (only 500mg) dropped by 26.2% to $10.99 at Muscle and Strength
- Jun 20, 2025NOW L-Carnitine 180 Vcaps dropped by 15.3% to $28.79 at AllStarHealth
- Jun 19, 2025NOW L-Carnitine 16 Oz. (only Liquid 3000mg - Citrus) dropped by 6.2% to $19.68 at DPS Nutrition
- Jun 19, 2025VMI Sports L-Carnitine 1500 Heat Liquid 31 Servings (only Patriot Pop) dropped by 18.8% to $16.19 at iHerb.com
- Jun 11, 2025NOW Acetyl L-Carnitine 50 Vcaps dropped by 17.7% to $7.89 at AllStarHealth
- Jun 05, 2025Gaspari Nutrition Liquid Carnitine 3000 32 Servings (only Orange Pineapple) dropped by 9.3% to $15.99 at DPS Nutrition
- Jun 03, 2025Body First Acetyl-L Carnitine 120 Vcaps dropped by 35% to $3.25 at AllStarHealth
- May 31, 2025BODYSTRONG L-Carnitine Liquid 16 Oz. dropped by 20% to $13.59 at AllStarHealth
- May 31, 2025Nootropics Depot Acetyl L-Carnitine 90 Capsules dropped by 9.1% to $19.99 at Nootropics Depot
- May 25, 2025Carlson Acetyl L-Carnitine 100 Grams dropped by 32.9% to $27.06 at iHerb.com
- May 24, 2025VMI Sports L-Carnitine 3000 31 Servings (only Gummy Bear) dropped by 7.7% to $23.99 at Natural Body Inc
- Apr 21, 2025AllMax Nutrition L-Carnitine + Tartrate 120 Capsules dropped by 11.1% to $16.00 at AllStarHealth
- Apr 16, 2025NutraKey L-Carnitine 3000 31 Servings (only Green Apple Pucker, Orange Delight) dropped by 17.4% to $18.99 at DPS Nutrition
- Apr 16, 2025NutraKey L-Carnitine 3000 31 Servings (only Grape Crush) dropped by 24% to $18.99 at DPS Nutrition
- Feb 25, 2025SAN Alcar 100 Tablets dropped by 9.1% to $19.99 at AllStarHealth
- Feb 17, 2025Country Life Acetyl L-Carnitine 60 Vcaps dropped by 52.5% to $29.47 at VitaCost.com
- Feb 14, 2025NOW L-Carnitine 60 Capsules dropped by 14.1% to $7.29 at AllStarHealth
- Feb 12, 2025Rich Piana 5% Nutrition Liquid L-Carnitine 3150 32 Servings (only Watermelon Candy) dropped by 6.7% to $21.69 at DPS Nutrition
- Aug 27, 2024iSatori L-Carnitine LS3 - 1500 16 Oz. (only Strawberry Kiwi) dropped by 8.3% to $21.99 at Amazon
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Aug 02, 2024New Flavors for X16 Limitless by Magnum Nutraceuticals is Here!
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May 30, 2024CLUMPY Supplements? Not Anymore with NNB Nutrition FlowTech!
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Apr 06, 2024GBB (Gamma Butyrobetaine) in 1 Minute | ProGBB by SYNMR for SWEAT!
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Mar 06, 2024CHERRY PEACH L-Carnitine Liquid? It works! Musclesport CarniShred + MitoBurn
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Feb 28, 2024Liquid L-Carnitine: Metabolism Booster from Primeval Labs
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Dec 26, 2023Musclesport CarniShred Baja Splash Surprise Release
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Nov 16, 2023Stronger L-Carnitine Liquid! Musclesport CarniShred +MitoBurn
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Apr 24, 2023Animal JUICED Aminos: Now with Electrolytes
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Apr 10, 2023Morphogen Synthegen: Intra-Workout Powerhouse
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Mar 27, 2023Core Nutritionals BURN: 4 New Flavors, Minor Label Updates
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Mar 10, 2023New Pre-Kaged Elite Flavors: Orange Mango and Caribbean Sunrise
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Mar 08, 2023Fat Burner PILLS VS POWDER?! Burn iQ and the Great Debate
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Jan 31, 2023Kaged MINDSET w/ Brian Rand & Team Kaged | Episode 081
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Jan 19, 2023Kaged Mindset Unboxing: Find your FLOW
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Dec 31, 2022MuscleTech Burn iQ Capsules: The Smarter Way to Lose Weight
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Nov 24, 2022MuscleTech Burn iQ Thermo: The Smart Fat Burner (Powder)
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Oct 31, 2022Arms Race CLARITY: Upgraded Nootropic Energy (137.5mg Caffeine)
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Apr 14, 2022DREW PETERS | PricePlow Episode 065
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Mar 08, 2021Best Carnitine Liquid?! SteelFit Steel Burn Frozen Rocket Pop!
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Sep 01, 2020ENERGY DRINK GAME CHANGER | Ghost Energy Tropical Mango Review
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Jun 26, 2020Pure CarniPure L-Carnitine You Can FINISH: SteelFit Steel Burn
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Jul 27, 2019Fight Fat and Combat Carbs! | Ghost Burn INGREDIENTS Reviewed
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Mar 09, 2019What is GBB (Gamma Butyrobetaine)? SYNMR's ProGBB Explained!
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Feb 01, 2019VMI Sports | L-Carnitine 1500 HEAT Flavors Review
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Nov 30, 2018BEST Nootropic Energy Drink | SNS Focus XT Review
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Aug 27, 2018Performax Labs EAmino Max Review: Goodbye BCAAs!
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Aug 23, 2018VMI Sports L-Carnitine 1500 HEAT Review: Feel the Heat!
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Jul 16, 2018Keto Connect Podcast: Supplements for Keto Dieters w/ Mike at PricePlow
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Jun 27, 2017Giant Sports Giant Keto Review - BHB Supplements WORK!
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May 10, 2017NutraKey's Supplement Flavors Rule! Lex Kovacs Explains Why
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