Product Image

Acetyl L-Carnitine 500 mg

Swanson
4.7
★ ★ ★ ★ ★
(1308 ratings)
Acetyl L-Carnitine 500 mg
Product Image
Score86
A focused ALCAR HCl capsule with a useful amount and excellent practicality. It supports cellular and brain energy without broader pathway coverage.
How scoring works
Quantity:100 Capsule(s) • (100 servings)
Goals:
Energy
Metabolism Boost
Brain Health
Productivity Boost
Cognitive Support
Mental Focus
Anti-Aging

Score 86

A focused ALCAR HCl capsule with a useful amount and excellent practicality. It supports cellular and brain energy without broader pathway coverage.
How scoring works

Also available as

1 option
240 servings Acetyl L-Carnitine 500 mg • 240 Capsule(s) • 240 servings $36.79 ($0.15 per serving)
$16.09($0.16 per serving)
iHerb
$ 16.09
iHerb
$ 16.09
Amazon
$ 21.09
Report prices

Analysis

The acetylated hydrochloride form is appropriate for brain and cellular-energy support. Its amount reaches the lower end of a commonly useful range.

A single active provides depth for mitochondrial fuel handling but no broader stimulant or adaptogen coverage. Weight-loss effects are likely modest without other lifestyle measures.

One capsule and a high serving count make ongoing use convenient. Buyers seeking verified purity will need details beyond the supplied information.

Who is it for
  • Adults seeking stimulant-free energy support
  • Regular ALCAR users
Best for
  • Mental-fatigue routines
  • Focused mitochondrial support

Pros

  • Appropriate acetylated form
  • Useful amount
  • High serving count

Cons

  • No branded source
  • No purity testing supplied
  • Single pathway only

Warnings

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

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

Energy
Energy
Impact
Highest effect
A Goal FitA Strength of SupportB CoverageA+ Formula Quality
Acetyl L-Carnitine · 500 mg

Acetyl L-carnitine supports fatty-acid transport into mitochondria and also contributes to acetylcholine metabolism. A 500 mg capsule provides a useful targeted amount in the brain-accessible acetylated form.

The formula spans metabolic fuel use and cognitive-energy support without relying on stimulants. Evidence is more useful for older adults or people with specific fatigue concerns than for universal performance enhancement.

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

Acetyl-L-carnitine directly supports transport and use of fatty acids in mitochondria. The acetylated form is clearly identified at a useful amount in one capsule.

The focused design offers good depth for cellular-energy metabolism without thermogenic or glycemic ingredients. Missing branded sourcing and purity testing leave a modest quality gap.

Study evidence
Acetyl L-Carnitine Adverse 1 study
Brain Health
Brain Health
Impact
Highest effect
A- Goal FitA- Strength of SupportC CoverageA Formula Quality

Acetyl-L-carnitine is well suited to brain energy support because the acetylated form reaches neural tissue more readily than standard carnitine. The exact amount is useful and easy to dose.

The single-active formula is focused but does not cover memory signaling, stress adaptation, or structural fats. No branded source or independent purity testing is disclosed.

Study evidence
Acetyl L-Carnitine Supportive 19 studies
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 brain energy and acetylcholine-related metabolism, making it relevant to mental stamina. Human evidence is useful for fatigue and selected cognitive populations but less certain for a rapid productivity boost in healthy adults.

The 500 mg amount reaches a meaningful range and the hydrochloride form is clearly identified. The focused formula provides strong depth without alertness or stress-adaptation coverage.

Study evidence
Acetyl L-Carnitine Supportive 1 study
Acetyl L-Carnitine Supportive 1 study
Cognitive Support
Cognitive Support
Impact
High effect
B Goal FitA- Strength of SupportC- CoverageA Formula Quality
Acetyl L-Carnitine · 500 mg

Acetyl L-carnitine can reach the brain and support mitochondrial energy, which may help mental fatigue and processing in selected users. Human benefits appear more consistent with aging or impaired energy status than as a broad enhancer for healthy adults.

The 500 mg amount and acetyl hydrochloride form are clearly disclosed and provide useful depth in one pathway. No branded source or purity testing is supplied, but the focused single-active design avoids unnecessary additions.

Study evidence
Acetyl L-Carnitine Supportive 20 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 can reach the brain and supports mitochondrial energy, making it relevant to mental stamina and clarity. Human cognitive evidence is useful in selected populations but less decisive for acute focus in healthy adults.

The exact acetylated form and amount are clearly disclosed in a streamlined capsule. The 500 mg amount is useful but sits toward the lower end of common supplemental use.

Study evidence
Acetyl L-Carnitine Supportive 7 studies

Ingredients

IngredientAmount per serving
Acetyl L-Carnitine HCl
500 mg
Adults 18–50
Report overview
Acetyl L-Carnitine · 500 mg OverallScore95
A- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The acetylated carnitine form is well matched to cognitive and metabolic support because it can reach the brain more readily than standard carnitine. One capsule provides a clearly disclosed, useful amount with uncomplicated dosing. Cost efficiency is excellent, though the supplied label details do not mention branded sourcing, cGMP manufacturing, or purity testing.

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>
87 Budget

Acetyl L-Carnitine 500 mg

Swanson
<p>It offers a lower listed serving cost while retaining 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. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. [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
  21. 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
  22. 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
  23. 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