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Acetyl-L-Carnitine 500 mg

California Gold Nutrition
4.7
★ ★ ★ ★ ★
(3497 ratings)
Acetyl L-Carnitine 500 mg
Product Image
Score86
A practical ALCAR HCl capsule with useful dosing and clean focus. It offers good brain-energy support but limited sourcing detail.
How scoring works
Quantity:60 Capsule(s) • (60 servings)
Goals:
Energy
Cognitive Support
Anti-Aging
Metabolism Boost
Mental Focus
Productivity Boost
Brain Health

Score 86

A practical ALCAR HCl capsule with useful dosing and clean focus. It offers good brain-energy support but limited sourcing detail.
How scoring works
$19.10($0.31 per serving)
iHerb
$ 19.10
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Analysis

Acetyl-L-carnitine hydrochloride is the only active and reaches a useful starting amount. The acetylated form is well aligned with cognitive and mitochondrial support.

A narrow formula avoids hidden blends and makes total intake clear. Weight-loss and metabolism benefits remain indirect rather than dependable outcomes.

One capsule and a moderate count work well for a trial or ongoing use. Stronger verification of raw-material sourcing would improve transparency.

Who is it for
  • Adults seeking focused ALCAR support
  • Users wanting a simple one-capsule routine
Best for
  • Mental-fatigue support
  • Stimulant-free cellular energy

Pros

  • Clearly identified ALCAR HCl
  • Useful amount
  • One-capsule serving

Cons

  • No branded source
  • No purity verification
  • No broader cognitive ingredients

Warnings

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

70 High impact

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

.

Value for money

94 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

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

Acetyl-L-carnitine supports mitochondrial fuel handling and is relevant to both physical and mental energy. The 500 mg amount is within a commonly used supplemental range, although results may depend on baseline status and the reason for fatigue.

The hydrochloride form and exact amount are clearly identified in a focused formula. No alertness stimulant or stress-resilience ingredient is included, so the product offers depth in one pathway rather than broad coverage.

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 can enter the brain and supports mitochondrial energy and acetylcholine-related metabolism. Its evidence appears most relevant to aging, low carnitine status, or specific clinical contexts rather than guaranteed improvement in healthy adults.

The hydrochloride form and exact 500 mg amount are clearly disclosed and fall within a practical starting range. A single-ingredient design provides strong depth for cellular energy but no stress, circulation, membrane, or broader neurotransmitter coverage.

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

Acetyl-L-carnitine at 500 mg supports mitochondrial fatty-acid transport and can reach the brain, making it relevant to age-related energy and cognitive function. The hydrochloride form and exact amount are clearly disclosed.

The dose sits at the lower end of common clinical use and the formula does not cover inflammation, structural aging, or glycation. Acetyl-L-carnitine can feel activating or cause digestive discomfort in sensitive users.

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

Acetyl-L-carnitine provides a direct and well-dosed approach to mitochondrial energy metabolism. Its acetylated form is clearly identified and suited to a focused cellular-energy role.

Evidence for mitochondrial support is stronger than evidence for meaningful fat loss in otherwise healthy adults. The single-active design offers good depth but no broader thermogenic, glycemic, or thyroid support.

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

Acetyl-L-carnitine can reach the brain and supports mitochondrial energy and acetylcholine production. The clearly disclosed amount falls within a commonly used supplemental range.

The focused formula provides meaningful depth for mental energy but does not add alertness, stress-resilience, or complementary neurotransmitter pathways. Evidence for sharper focus is more convincing in people with fatigue or cognitive impairment than in healthy, well-rested adults.

Study evidence
Acetyl L-Carnitine Supportive 7 studies
Productivity Boost
Productivity Boost
Impact
High effect
B Goal FitB+ Strength of SupportC- CoverageA+ Formula Quality
Acetyl L-Carnitine · 500 mgAcetyl L-Carnitine · 500 mg

Acetyl-L-carnitine supports mitochondrial energy handling and can provide acetyl groups used in acetylcholine production. Its cognitive evidence is more convincing in people with age-related or clinical impairment than in healthy adults seeking an immediate productivity boost.

The hydrochloride form and exact amount are clearly disclosed in a focused single-ingredient capsule. The serving sits at the lower end of common supplemental use, giving moderate depth without unrelated ingredients.

Study evidence
Acetyl L-Carnitine Supportive 1 study
Acetyl L-Carnitine Supportive 1 study

Ingredients

IngredientAmount per serving
Acetyl-L-Carnitine (Acetyl-L-Carnitine Hydrochloride)
 500 mg
Gluten Free Adults 18–50 Dairy Free
Report overview
Acetyl L-Carnitine (Acetyl-L-Carnitine Hydrochloride) · 500 mg OverallScore93
A Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB Value

Acetyl-L-carnitine hydrochloride is the only active carnitine form and is supplied at a standard clinical amount. The exact dose is clear, though no premium arginate or branded raw material is identified. A low cost per active amount provides good value for a straightforward formula.

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