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Acetyl-L-Carnitine

Seeking Health
4.9
★ ★ ★ ★ ★
(456 ratings)
Acetyl L-Carnitine 500 mg
Product Image
Score85
A clean ALCAR HCl capsule with a useful amount and strong convenience. It is focused but does not cover broader cognitive pathways.
How scoring works
Quantity:90 Capsule(s) • (90 servings)
Goals:
Mental Focus
Brain Health
Energy
Cognitive Support
Anti-Aging
Metabolism Boost
Productivity Boost

Score 85

A clean ALCAR HCl capsule with a useful amount and strong convenience. It is focused but does not cover broader cognitive pathways.
How scoring works
$27.00($0.30 per serving)
Vitacost
$ 27.00
iHerb
$ 27.00
Pure Formulas
$ 27.00
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Analysis

The acetylated hydrochloride form is appropriate for mitochondrial and cognitive-energy support. Its amount is useful without creating a complicated dosing routine.

The single ingredient keeps the formula easy to evaluate. It may help fatigue-related mental energy more plausibly than acute productivity or direct weight loss.

One capsule and a high count support regular use. Users seeking broader cognition support would need complementary ingredients elsewhere.

Who is it for
  • Adults seeking a focused ALCAR capsule
  • Regular users wanting many servings
Best for
  • Brain-energy support
  • Stimulant-free mitochondrial routines

Pros

  • Appropriate ALCAR HCl form
  • Useful amount
  • High serving count

Cons

  • No branded sourcing
  • No purity verification
  • No complementary cognitive actives

Warnings

  • May cause restlessness or stomach upset
  • Take earlier if it affects sleep
  • Discuss use with thyroid or seizure 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

67 High impact

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

.

Value for money

95 Highest impact

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

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Report analysis

Goals

Mental Focus
Mental Focus
Impact
Highest effect
A- Goal FitA- Strength of SupportC+ CoverageA+ Formula Quality
Acetyl L-Carnitine · 500 mg

Acetyl-L-carnitine can enter the brain and support mitochondrial energy, making it a focused option for mental energy and cognitive maintenance. The 500 mg amount reaches the lower end of a useful supplemental range rather than a high-potency level.

The acetylated form and exact amount are clearly stated in one capsule. No branded raw material or purity testing is disclosed, but the single-active design avoids formulation clutter.

Study evidence
Acetyl L-Carnitine Supportive 7 studies
Brain Health
Brain Health
Impact
Highest effect
B+ Goal FitA Strength of SupportC+ CoverageA+ Formula Quality

Acetyl-L-carnitine at 500 mg directly supports mitochondrial energy metabolism and can reach the nervous system. Human evidence is most relevant to cognitive aging or fatigue rather than universal memory enhancement.

The HCl form and standalone amount are clearly disclosed. The streamlined formula gives one brain-energy pathway useful depth but does not address membranes, neurotransmitters, or stress adaptation broadly.

Study evidence
Acetyl L-Carnitine Supportive 19 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
Cognitive Support
Cognitive Support
Impact
Highest effect
B Goal FitA Strength of SupportC- CoverageA+ Formula Quality
Acetyl L-Carnitine · 500 mg

Acetyl-L-carnitine supports mitochondrial energy and acetylcholine-related brain function through a direct neurological mechanism. Its value is most credible for age-related decline or low carnitine status rather than as a universal memory enhancer.

The 500 mg amount is meaningful and the hydrochloride form is clearly disclosed. A single-active design provides focused depth but does not cover circulation, stress adaptation, or structural brain nutrients.

Study evidence
Acetyl L-Carnitine Supportive 20 studies
Anti-Aging
Anti-Aging
Impact
High effect
B Goal FitA- Strength of SupportD+ CoverageA+ Formula Quality

Acetyl-L-carnitine supports mitochondrial fatty-acid use and can reach the brain, making it relevant to cellular energy and cognitive function with age. Human evidence supports selected fatigue, nerve, and cognitive uses more clearly than a general anti-aging effect.

The HCl form and exact amount are fully disclosed in a focused single-ingredient capsule. The 500 mg serving reaches the lower end of commonly used supplemental amounts without unrelated additions.

Study evidence
Acetyl L-Carnitine Supportive 1 study
Metabolism Boost
Metabolism Boost
Impact
High effect
B Goal FitB+ Strength of SupportD+ CoverageA+ Formula Quality
Acetyl L-Carnitine · 500 mg

Acetyl L-carnitine directly supports fatty-acid transport into mitochondria for energy production. The 500 mg amount reaches a useful starting level in a clearly identified hydrochloride form.

The formula is narrow and does not add thermogenic, thyroid, or glycemic actives. Its focused design avoids padding and gives the mitochondrial pathway useful depth.

Study evidence
Acetyl L-Carnitine Adverse 1 study

Ingredients

IngredientAmount per serving
Acetyl-L-Carnitine (Acetyl-L-Carnitine HCl)
 500 mg
Adults 18–50 Dairy Free
Report overview
Acetyl L-Carnitine (Acetyl-L-Carnitine HCl) · 500 mg OverallScore90
A- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB Value

The formula uses only Acetyl-L-Carnitine HCl, a clearly identified form suited to the collection goal. One capsule supplies a fully disclosed dose at the lower end of the standard range. Cost efficiency is good, although no branded raw material, cGMP claim, or purity-testing detail is provided.

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>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

The Vitamin Shoppe
<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 Value

Acetyl L-Carnitine 500 mg

Swanson
<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>
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>
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