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Acetyl L-Carnitine 500 mg

Swanson
4.7
★ ★ ★ ★ ★
(1299 ratings)
Acetyl L-Carnitine 500 mg
Product Image
Score87
A clear, focused ALCAR HCl capsule with excellent long-term practicality. Its benefits center on brain and cellular energy, not direct weight loss.
How scoring works
Quantity:240 Capsule(s) • (240 servings)
Goals:
Cognitive Support
Energy
Metabolism Boost
Productivity Boost
Brain Health
Mental Focus
Anti-Aging
Weight Loss

Score 87

A clear, focused ALCAR HCl capsule with excellent long-term practicality. Its benefits center on brain and cellular energy, not direct weight loss.
How scoring works

Also available as

1 option
100 servings Acetyl L-Carnitine 500 mg • 100 Capsule(s) • 100 servings $16.09 ($0.16 per serving)
$36.79($0.15 per serving)
iHerb
$ 36.79
Amazon
$ 36.99
iHerb
$ 36.79
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Analysis

Acetyl-L-carnitine hydrochloride is the only active and is delivered at a practical starting amount. The acetylated form supports mitochondrial and brain-energy pathways without a stimulant.

The formula may fit mental fatigue, cognitive support, and cellular-energy routines. It is less convincing for direct weight loss or a reliable rise in resting metabolism.

The large bottle supports established ongoing use. New users may prefer a smaller package before committing to many months at one dose.

Who is it for
  • Established ALCAR users
  • Adults seeking stimulant-free energy support
Best for
  • Long-term cognitive-energy routines
  • High serving-count convenience

Pros

  • Appropriate acetylated form
  • Useful amount
  • Very high serving count

Cons

  • No branded source
  • No purity testing supplied
  • Large bottle is unsuitable for a brief trial

Warnings

  • May cause nausea or restlessness
  • Take earlier if it affects sleep
  • Review use with seizure or thyroid medicines

Nutrient quality

94 Highest impact

A specific acetyl-L-carnitine salt and meaningful amount support the intended energy and cognitive uses. The focused formula avoids obvious filler or excessive dosing.

.

Ingredient transparency

83 Highest impact

The active form and amount are disclosed clearly without a hidden blend. Daily-use directions and non-active ingredients are not supplied.

.

Customer satisfaction

69 High impact

The available rating is strong and the sample is large. Detailed feedback was not supplied, so repeated complaints and alignment with the intended use remain uncertain.

.

Value for money

99 Highest impact

A meaningful focused amount and strong supply deliver strong practical value. No unnecessary active extras inflate the formula.

.
Report analysis

Goals

Cognitive Support
Cognitive Support
Impact
Highest effect
B+ Goal FitA+ Strength of SupportC CoverageA Formula Quality
Acetyl L-Carnitine · 500 mg

Acetyl L-carnitine directly supports brain mitochondrial energy and can cross the blood-brain barrier. Human evidence is most relevant to mental fatigue and age-related cognitive settings rather than universal memory enhancement.

The 500 mg HCl serving is clearly disclosed and reaches the lower end of an effective range. The focused formula lacks complementary membrane, circulation, or stress-support actives but delivers strong depth in cellular energy support.

Study evidence
Acetyl L-Carnitine Supportive 20 studies
Energy
Energy
Impact
Highest effect
B+ Goal FitA- Strength of SupportB- CoverageA+ Formula Quality
Acetyl L-Carnitine · 500 mg

Acetyl L-carnitine provides a clearly identified compound that may support mitochondrial fuel use and cognitive energy. The amount reaches the lower end of a standard effective range.

Evidence varies by population, and the serving may be modest for users seeking a stronger targeted amount. The focused formula is transparent but offers no acute-alertness or adaptogen component.

Study evidence
Acetyl L-Carnitine Supportive 19 studies
Metabolism Boost
Metabolism Boost
Impact
Highest effect
A- Goal FitA- Strength of SupportC CoverageA+ Formula Quality
Acetyl L-Carnitine · 500 mg

Acetyl L-carnitine at 500 mg directly supports transport-related mitochondrial energy pathways. The acetylated form and exact amount are clearly disclosed.

The amount sits at the lower end of a useful range and may provide focused support rather than a strong body-composition effect. Human results on fat loss or higher energy expenditure remain variable.

Study evidence
Acetyl L-Carnitine Adverse 1 study
Productivity Boost
Productivity Boost
Impact
Highest effect
B Goal FitA- Strength of SupportC CoverageA+ Formula Quality
Acetyl L-Carnitine · 500 mgAcetyl L-Carnitine · 500 mg

Acetyl L-carnitine supports mitochondrial energy and neurological function that may help sustained productivity. The 500 mg amount and named hydrochloride form provide a clear, meaningful starting dose.

Evidence is stronger for fatigue or cognitive problems in selected populations than for immediate enhancement in healthy adults. Its focused design provides depth without acute alertness or stress-modulating support.

Study evidence
Acetyl L-Carnitine Supportive 1 study
Acetyl L-Carnitine Supportive 1 study
Brain Health
Brain Health
Impact
High effect
B+ Goal FitB+ Strength of SupportC- CoverageA Formula Quality

Acetyl L-carnitine directly supports brain energy metabolism and acetylcholine production. The disclosed amount reaches the lower end of common effective use.

The acetylated hydrochloride form and individual amount are clearly stated. The focused formula has good depth but does not cover structural lipids or broader neuroprotection.

Study evidence
Acetyl L-Carnitine Supportive 19 studies
Mental Focus
Mental Focus
Impact
High effect
B- Goal FitB Strength of SupportC CoverageA+ Formula Quality
Acetyl L-Carnitine · 500 mg

Acetyl-L-carnitine is a brain-accessible form that supports cellular energy and acetylcholine metabolism. Evidence is more convincing for fatigue or age-related cognitive concerns than for acute attention in healthy adults.

The serving amount is clearly disclosed and provides a useful starting level, though some studied uses employ larger daily amounts. The single-active formula is coherent and free of distracting additions.

Study evidence
Acetyl L-Carnitine Supportive 7 studies

Ingredients

IngredientAmount per serving
Acetyl L-Carnitine (Acetyl L-Carnitine HCl)
 500 mg
Adults 18–50
Report overview
Acetyl L-Carnitine (Acetyl L-Carnitine HCl) · 500 mg OverallScore95
A- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value
Acetyl L-carnitine HCl provides the collection-specific acetylated form at the lower end of the standard effective range. The exact form and amount are clear, although the supplied information does not mention branded sourcing or purity testing. Its low cost per effective serving supports strong value.
View ingredientView products
Loading alternative details
84 Performance

Acetyl-L-Carnitine Arginate

Life Extension
<p>Ingredient coverage is more compelling because two identified acetyl-L-carnitine salts provide a combined 620 mg serving. The original already has a clear 500 mg single-ingredient dose; the alternative provides a more differentiated and clearly disclosed way to support the same collection.</p>
81 Performance

RegenerLife Watermelon

Natural Factors
<p>Ingredient coverage is more compelling because 1,500 mg acetyl-L-carnitine is paired with 300 mg CoQ10 plus measured glutathione and antioxidant enzymes. The original already has a clear 500 mg single-ingredient dose; the alternative provides a more differentiated and clearly disclosed way to support the same collection.</p>
81 Performance

CoQ10 + Alpha Lipoic Acid + Acetyl L-Carnitine HCl

Nature's Lab
<p>Ingredient coverage is more compelling because 500 mg acetyl-L-carnitine is paired with 300 mg alpha-lipoic acid and 200 mg CoQ10. The original already has a clear 500 mg single-ingredient dose; the alternative provides a more differentiated and clearly disclosed way to support the same collection.</p>
86 Budget

Acetyl L-Carnitine 500 mg

Swanson
<p>No eligible candidate has a lower listed serving cost, but it is among the closest available cost options with a clearly described active formula. The original already has a clear 500 mg single-ingredient dose; in comparison, a focused 500 mg acetyl-L-carnitine hydrochloride serving avoids unrelated additions.</p>
86 Budget

Acetyl L-Carnitine 500 mg

Source Naturals
<p>No eligible candidate has a lower listed serving cost, but it is among the closest available cost options with a clearly described active formula. The original already has a clear 500 mg single-ingredient dose; in comparison, a focused 500 mg acetyl-L-carnitine hydrochloride serving avoids unrelated additions.</p>
86 Budget

Acetyl-L-Carnitine 500 mg

The Vitamin Shoppe
<p>No eligible candidate has a lower listed serving cost, but it is among the closest available cost options with a clearly described active formula. The original already has a clear 500 mg single-ingredient dose; in comparison, a focused 500 mg acetyl-L-carnitine hydrochloride serving avoids unrelated additions.</p>
85 Value

Acetyl L-Carnitine 500 mg

Source Naturals
<p>It balances practical value with a purposeful formula because a focused 500 mg acetyl-L-carnitine hydrochloride serving avoids unrelated additions. The original already has a clear 500 mg single-ingredient dose; the alternative offers a useful trade-off between ingredient focus, disclosed amounts, and serving cost.</p>
84 Value

Acetyl L-Carnitine 500 mg

Nature's Way
<p>It balances practical value with a purposeful formula because a focused 500 mg acetyl-L-carnitine hydrochloride serving avoids unrelated additions. The original already has a clear 500 mg single-ingredient dose; the alternative offers a useful trade-off between ingredient focus, disclosed amounts, and serving cost.</p>
84 Value

Acetyl L-Carnitine Caps 500 mg

Country Life
<p>It balances practical value with a purposeful formula because 500 mg acetyl-L-carnitine is paired with a moderate 8.5 mg vitamin B6 amount. The original already has a clear 500 mg single-ingredient dose; the alternative offers a useful trade-off between ingredient focus, disclosed amounts, and serving cost.</p>
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Acetyl-L-carnitine treatment in minimal hepatic encephalopathy.
    Malaguarnera M; Gargante MP; Cristaldi E; Vacante M; Risino C; Cammalleri L; Pennisi G; Rampello L · Digestive diseases and sciences · 2008
    Randomized trial125 participantsCognitive Support Brain Health forAcetyl L-Carnitine
  2. Acetyl-L-carnitine improves cognitive functions in severe hepatic encephalopathy: a randomized and controlled clinical trial.
    Malaguarnera M; Vacante M; Motta M; Giordano M; Malaguarnera G; Bella R; Nunnari G; Rampello L; Pennisi G · Metabolic brain disease · 2012
    Randomized trial61 participantsBrain Health Cognitive Support forAcetyl L-Carnitine
  3. Oral acetyl-L-carnitine therapy reduces fatigue in overt hepatic encephalopathy: a randomized, double-blind, placebo-controlled study.
    Malaguarnera M; Vacante M; Giordano M; Pennisi G; Bella R; Rampello L; Malaguarnera M; Li Volti G; Galvano F · The American journal of clinical nutrition · 2011
    Randomized trial121 participantsEnergy forAcetyl L-Carnitine
  4. Acetyl L-carnitine slows decline in younger patients with Alzheimer's disease: a reanalysis of a double-blind, placebo-controlled study using the trilinear approach.
    Brooks JO; Yesavage JA; Carta A; Bravi D · International psychogeriatrics · 1998
    Randomized trial334 participantsCognitive Support forAcetyl L-Carnitine
  5. A 1-year controlled trial of acetyl-l-carnitine in early-onset AD.
    Thal LJ; Calvani M; Amato A; Carta A · Neurology · 2000
    Randomized trial229 participantsCognitive Support forAcetyl L-Carnitine
  6. Double-blind, placebo controlled study of acetyl-l-carnitine in patients with Alzheimer's dementia.
    Rai G; Wright G; Scott L; Beston B; Rest J; Exton-Smith AN · Current medical research and opinion · 1990
    Randomized trial36 participantsBrain Health forAcetyl L-Carnitine
  7. Carnitine for fatigue in multiple sclerosis.
    Tejani AM; Wasdell M; Spiwak R; Rowell G; Nathwani S · The Cochrane database of systematic reviews · 2012
    Systematic review1 studies pooledEnergy forAcetyl L-Carnitine
  8. Mental impairment in aging: selection of patients, methods of evaluation and therapeutic possibilities of acetyl-L-carnitine.
    Passeri M; Iannuccelli M; Ciotti G; Bonati PA; Nolfe G; Cucinotta D · International journal of clinical pharmacology research · 1989
    Randomized trial30 participantsBrain Health forAcetyl L-Carnitine
  9. Double-blind, multicenter trial comparing acetyl l-carnitine with placebo in the treatment of fibromyalgia patients.
    Rossini M; Di Munno O; Valentini G; Bianchi G; Biasi G; Cacace E; Malesci D; La Montagna G; Viapiana O; Adami S · Clinical and experimental rheumatology · 2007
    Randomized trial102 participantsEnergy forAcetyl L-Carnitine
  10. The Effect of Acylcarnitines on Cognitive Function: A Two-Sample Mendelian Randomization Study.
    Luan S; Zhang J; Wang C; Wang Z; Zhou J · Brain and behavior · 2025
    OtherBrain Health forAcetyl L-Carnitine
  11. Acylcarnitines metabolism in depression: association with diagnostic status, depression severity and symptom profile in the NESDA cohort.
    Montanari S; Jansen R; Schranner D; Kastenmüller G; Arnold M; Janiri D; Sani G; Bhattacharyya S; Mahmoudian Dehkordi S; Dunlop BW; Rush AJ; Penninx BWHJ; Kaddurah-Daouk R; Milaneschi Y · Translational psychiatry · 2025
    Cohort study2,574 participantsEnergy forAcetyl L-Carnitine
  12. Acetyl-L-carnitine Slows the Progression from Prefrailty to Frailty in Older Subjects: A Randomized Interventional Clinical Trial.
    Malaguarnera G; Catania VE; Bertino G; Chisari LM; Castorina M; Bonfiglio C; Cauli O; Malaguarnera M · Current pharmaceutical design · 2022
    Randomized trial92 participantsAnti-Aging forAcetyl L-Carnitine
  13. Long-term acetyl-L-carnitine treatment in Alzheimer's disease.
    Spagnoli A; Lucca U; Menasce G; Bandera L; Cizza G; Forloni G; Tettamanti M; Frattura L; Tiraboschi P; Comelli M · Neurology · 1991
    Randomized trial130 participantsBrain Health Cognitive Support forAcetyl L-Carnitine
  14. Pharmaco-electroencephalographic and clinical effects of the cholinergic substance--acetyl-L-carnitine--in patients with organic brain syndrome.
    Herrmann WM; Dietrich B; Hiersemenzel R · International journal of clinical pharmacology research · 1990
    Randomized trialBrain Health forAcetyl L-Carnitine
  15. Acetyl-L-carnitine in the treatment of mildly demented elderly patients.
    Passeri M; Cucinotta D; Bonati PA; Iannuccelli M; Parnetti L; Senin U · International journal of clinical pharmacology research · 1990
    Randomized trial60 participantsBrain Health Mental Focus forAcetyl L-Carnitine
  16. A double-blind, parallel, multicenter comparison of L-acetylcarnitine with placebo on the attention deficit hyperactivity disorder in fragile X syndrome boys.
    Torrioli MG; Vernacotola S; Peruzzi L; Tabolacci E; Mila M; Militerni R; Musumeci S; Ramos FJ; Frontera M; Sorge G; Marzullo E; Romeo G; Vallee L; Veneselli E; Cocchi E; Garbarino E; Moscato U; Chiurazzi P; D'Iddio S; Calvani M; Neri G · American journal of medical genetics. Part A · 2008
    Randomized trial63 participantsCognitive Support forAcetyl L-Carnitine
  17. Acetyl L-carnitine (ALC) treatment in elderly patients with fatigue.
    Malaguarnera M; Gargante MP; Cristaldi E; Colonna V; Messano M; Koverech A; Neri S; Vacante M; Cammalleri L; Motta M · Archives of gerontology and geriatrics · 2008
    Randomized trial96 participantsCognitive Support forAcetyl L-Carnitine
  18. The supplementation of acetyl-L-carnitine decreases fatigue and increases quality of life in patients with hepatitis C treated with pegylated interferon-α 2b plus ribavirin.
    Malaguarnera M; Vacante M; Bertino G; Neri S; Malaguarnera M; Gargante MP; Motta M; Lupo L; Chisari G; Bruno CM; Pennisi G; Bella R · Journal of interferon & cytokine research : the official journal of the International Society for Interferon and Cytokine Research · 2012
    Randomized trial60 participantsEnergy forAcetyl L-Carnitine
  19. Acetyl-L-carnitine reduces depression and improves quality of life in patients with minimal hepatic encephalopathy.
    Malaguarnera M; Bella R; Vacante M; Giordano M; Malaguarnera G; Gargante MP; Motta M; Mistretta A; Rampello L; Pennisi G · Scandinavian journal of gastroenterology · 2011
    Randomized trial67 participantsEnergy forAcetyl L-Carnitine
  20. A prospective study to evaluate the efficacy and safety of oral acetyl-L-carnitine for the treatment of chemotherapy-induced peripheral neuropathy.
    Sun Y; Shu Y; Liu B; Liu P; Wu C; Zheng R; Zhang X; Zhuang Z; Deng Y; Zheng L; Xu Q; Jiang B; Ouyang X; Gao J; Xu N; Li X; Jiang S; Liang C; Yao Y · Experimental and therapeutic medicine · 2020
    Randomized trial239 participantsEnergy forAcetyl L-Carnitine
  21. Metabolomic biomarkers for (R, S)-ketamine and (S)-ketamine in treatment-resistant depression and healthy controls: A systematic review.
    Kumar R; Nuñez NA; Joshi N; Joseph B; Verde A; Seshadri A; Cuellar Barboza AB; Prokop LJ; Medeiros GC; Singh B · Bipolar disorders · 2024
    Systematic reviewEnergy forAcetyl L-Carnitine
  22. Acetyl-L-Carnitine Supplementation During HCV Therapy With Pegylated Interferon-α 2b Plus Ribavirin: Effect on Work Performance; A Randomized Clinical Trial.
    Malaguarnera G; Pennisi M; Gagliano C; Vacante M; Malaguarnera M; Salomone S; Drago F; Bertino G; Caraci F; Nunnari G; Malaguarnera M · Hepatitis monthly · 2014
    Randomized trial62 participantsMental Focus Productivity Boost forAcetyl L-Carnitine
  23. [Psycho-functional changes in attention and learning under the action of L-acetylcarnitine in 17 young subjects. A pilot study of its use in mental deterioration].
    Lino A; Boccia MM; Rusconi AC; Bellomonte L; Cocuroccia B · La Clinica terapeutica · 1992
    Non-randomized trial17 participantsMental Focus forAcetyl L-Carnitine
  24. Acetyl-L-carnitine (ALC) in attention-deficit/hyperactivity disorder: a multi-site, placebo-controlled pilot trial.
    Arnold LE; Amato A; Bozzolo H; Hollway J; Cook A; Ramadan Y; Crowl L; Zhang D; Thompson S; Testa G; Kliewer V; Wigal T; McBurnett K; Manos M · Journal of child and adolescent psychopharmacology · 2008
    Randomized trial112 participantsMental Focus forAcetyl L-Carnitine
  25. Acetyl-L-carnitine for patients with hepatic encephalopathy.
    Martí-Carvajal AJ; Gluud C; Arevalo-Rodriguez I; Martí-Amarista CE · The Cochrane database of systematic reviews · 2019
    Meta-analysis398 participants5 studies pooledMental Focus forAcetyl L-Carnitine
  26. Low Bioavailability and High TMAO Production: Novel Insights Into Acetylcarnitine and Carnitine Metabolism.
    Krims-Davis K; Ozola M; Razzivina V; Gukalova B; Konrade I; Dambrova M; Liepinsh E · Molecular nutrition & food research · 2025
    Randomized trialMetabolism Boost forAcetyl L-Carnitine