Acetyl L-Carnitine & Alpha-Lipoic Acid

Acetyl L-Carnitine & Alpha-Lipoic Acid

Source Naturals4.6 (3,402 ratings)
Format:Tablet Quantity: 60 Tablet(s) · 60 servings
Goals
$19.98 $0.33 per serving

Product analysis

60 out of 100

Acetyl L-Carnitine & Alpha-Lipoic Acid pairs ingredients involved in cellular energy and antioxidant processes. Routine energy or focus benefits in healthy adults remain uncertain.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality34

The carnitine and calcium forms are identified, but their preparation quality cannot be judged confidently. The alpha-lipoic acid form is unspecified, leaving that part of the combination less clear.

Ingredient Transparency88

All listed amounts and the carnitine and calcium forms are disclosed. The alpha-lipoic acid form is unspecified, limiting a precise comparison with other combinations.

Value For Money60

The carnitine has a reasonably competitive cost for its declared amount. The other ingredients lack dependable comparisons to establish the value of the complete formula.

Customer Satisfaction85

Customer feedback is favorable across thousands of ratings. The broad review base supports the satisfaction pattern without proving energy or cognitive benefits.

Product Focus52

Carnitine gives the formula a plausible connection to energy handling and cognition. The main fatigue findings involve clinical populations, so ordinary energy, memory and productivity benefits in healthy adults remain uncertain.

Format
Tablet
Container
60 Tablet(s)
Per serving
$0.33
Customer rating
4.6 · 3,402 ratings
Report analysis

Goals

Metabolism Support
Impact
Lower effect
D+ Ingredient FitF PathwaysF EvidenceA+ Formulation Logic
Acetyl L-Carnitine · 500 mg
Study evidence
Energy
Impact
Moderate effect
D+ Ingredient FitD- PathwaysA+ EvidenceA+ Formulation Logic
Acetyl L-Carnitine · 500 mg

Acetyl L-carnitine has a biological connection to cellular energy handling. The 500 mg serving is recognized in the saved assessment, but the supplied fatigue evidence concerns older adults with clinical fatigue and does not establish a routine energy boost in healthy adults.

How this product is rated for Energy

Ingredient fit51

The saved assessment identifies 1 goal-related ingredients alongside 2 other actives, so the formula serves a broader purpose than energy support alone. The saved amount assessment considers 1 ingredients; undisclosed individual amounts limit the contribution that can be assigned.
Goal fit
The saved assessment identifies 1 goal-related ingredients alongside 2 other actives, so the formula serves a broader purpose than energy support alone.
Dose adequacy
The saved amount assessment considers 1 ingredients; undisclosed individual amounts limit the contribution that can be assigned.

Pathways40

The strongest saved connection concerns mitochondrial energy production. One reviewed energy mechanism reaches the saved level for substantial coverage.
Depth
The strongest saved connection concerns mitochondrial energy production.
Breadth
One reviewed energy mechanism reaches the saved level for substantial coverage.

Evidence95

The saved evidence finding is led by Acetyl L-Carnitine, among ingredients meeting the assessment’s amount requirement; this does not imply uniform energy benefit. The saved assessment recognizes preparation matches for the ingredients meeting its amount requirement, within the limitations of their underlying evidence.
Evidence strength
The saved evidence finding is led by Acetyl L-Carnitine, among ingredients meeting the assessment’s amount requirement; this does not imply uniform energy benefit.
Studied preparation
The saved assessment recognizes preparation matches for the ingredients meeting its amount requirement, within the limitations of their underlying evidence.

Formulation logic100

The saved findings identify no missing required partner among the assessed ingredients. No configured ingredient conflict was identified in the saved assessment. 1 of 1 credited ingredients meet the saved minimum amount criterion.
Partner coverage
The saved findings identify no missing required partner among the assessed ingredients.
Conflicts
No configured ingredient conflict was identified in the saved assessment.
Effective doses
1 of 1 credited ingredients meet the saved minimum amount criterion.
Study evidence
Brain Health
Impact
Moderate effect
D+ Ingredient FitF PathwaysB EvidenceA+ Formulation Logic

Acetyl L-carnitine relates to brain energy metabolism. The 500 mg serving offers partial dose support, while evidence from clinical populations does not establish routine cognitive benefit for healthy adults.

How this product is rated for Brain Health

Ingredient fit51

Brain-health ingredients share the formula with other actives, giving the mixture a broader focus. The assessed amounts provide partial dose support.
Goal fit
Brain-health ingredients share the formula with other actives, giving the mixture a broader focus.
Dose adequacy
The assessed amounts provide partial dose support.

Pathways19

The strongest assessed connection is cerebral energy metabolism, with limited coverage. No assessed pathway reaches the saved threshold for substantial coverage.
Depth
The strongest assessed connection is cerebral energy metabolism, with limited coverage.
Breadth
No assessed pathway reaches the saved threshold for substantial coverage.

Evidence76

Acetyl L-Carnitine provides the strongest effective-dose evidence in the saved findings, with limits on broader brain-health conclusions. The assessed ingredients at effective amounts meet the saved studied-preparation finding.
Evidence strength
Acetyl L-Carnitine provides the strongest effective-dose evidence in the saved findings, with limits on broader brain-health conclusions.
Studied preparation
The assessed ingredients at effective amounts meet the saved studied-preparation finding.

Formulation logic100

The assessed ingredients can contribute alone or have their required partner. No configured ingredient conflict was identified. 1 of 1 assessed ingredients reach the saved minimum dose threshold.
Partner coverage
The assessed ingredients can contribute alone or have their required partner.
Conflicts
No configured ingredient conflict was identified.
Effective doses
1 of 1 assessed ingredients reach the saved minimum dose threshold.
Study evidence
Longevity
Impact
Moderate effect
C- Ingredient FitF PathwaysC EvidenceA+ Formulation Logic

Acetyl L-carnitine at 500 mg and alpha-lipoic acid at 150 mg relate to mitochondrial energy processes and antioxidant activity. Their biological roles and selected disease-cohort findings do not establish routine preservation of function or longer life in healthy adults.

How this product is rated for Longevity

Ingredient fit58

Relevant ingredients sit within a broader formula with several other purposes, limiting its focus on healthy aging. The assessed amounts provide partial coverage of the saved reference levels, with undisclosed quantities limiting the assessment.
Goal fit
Relevant ingredients sit within a broader formula with several other purposes, limiting its focus on healthy aging.
Dose adequacy
The assessed amounts provide partial coverage of the saved reference levels, with undisclosed quantities limiting the assessment.

Pathways11

The strongest saved connection is mitochondrial energy production, with limited coverage. No pathway reaches the saved coverage threshold.
Depth
The strongest saved connection is mitochondrial energy production, with limited coverage.
Breadth
No pathway reaches the saved coverage threshold.

Evidence63

Acetyl L-Carnitine supplies the strongest saved evidence finding at the assessed amount; the scope of its actual cognitive evidence still matters. The effective entries are classified as studied preparations in the saved findings.
Evidence strength
Acetyl L-Carnitine supplies the strongest saved evidence finding at the assessed amount; the scope of its actual cognitive evidence still matters.
Studied preparation
The effective entries are classified as studied preparations in the saved findings.

Formulation logic100

The assessed ingredients can work alone or have their required partner. No configured ingredient conflict was found in the supplied assessment. All assessed ingredients reach the saved minimum amount threshold.
Partner coverage
The assessed ingredients can work alone or have their required partner.
Conflicts
No configured ingredient conflict was found in the supplied assessment.
Effective doses
All assessed ingredients reach the saved minimum amount threshold.
Study evidence
Cognitive Support
Impact
Moderate effect
D+ Ingredient FitD- PathwaysB EvidenceA+ Formulation Logic
Acetyl L-Carnitine · 500 mg

Acetyl L-carnitine is connected with cellular energy and acetylcholine-related processes. The 500 mg serving has a possible cognitive rationale, but the supplied clinical evidence does not establish a routine focus or memory benefit for healthy adults.

How this product is rated for Cognitive Support

Ingredient fit51

Several ingredients relate to cognitive support, but the formula also serves a broad range of other nutritional or health purposes. The assessed amounts provide partial alignment with the saved exposure comparisons; a serving amount is not a guarantee of benefit.
Goal fit
Several ingredients relate to cognitive support, but the formula also serves a broad range of other nutritional or health purposes.
Dose adequacy
The assessed amounts provide partial alignment with the saved exposure comparisons; a serving amount is not a guarantee of benefit.

Pathways40

The strongest assessed connection is cerebral energy buffering, with moderate coverage. One assessed mechanism reaches the saved coverage threshold, so coverage remains narrow.
Depth
The strongest assessed connection is cerebral energy buffering, with moderate coverage.
Breadth
One assessed mechanism reaches the saved coverage threshold, so coverage remains narrow.

Evidence79

Acetyl L-Carnitine provides the strongest evidence connection among the ingredients at the assessed amounts. That comparison does not imply a benefit for every user. The ingredients included in the saved effective-amount comparison meet its preparation criteria; this alone does not establish broad cognitive benefit.
Evidence strength
Acetyl L-Carnitine provides the strongest evidence connection among the ingredients at the assessed amounts. That comparison does not imply a benefit for every user.
Studied preparation
The ingredients included in the saved effective-amount comparison meet its preparation criteria; this alone does not establish broad cognitive benefit.

Formulation logic100

The assessed ingredients can stand alone or have the required partner present. No configured ingredient conflicts were identified in the supplied findings. 1 of 1 meet the saved minimum exposure comparison. Meeting it does not guarantee an effect.
Partner coverage
The assessed ingredients can stand alone or have the required partner present.
Conflicts
No configured ingredient conflicts were identified in the supplied findings.
Effective doses
1 of 1 meet the saved minimum exposure comparison. Meeting it does not guarantee an effect.
Study evidence
Mental Focus
Impact
Moderate effect
D+ Ingredient FitD- PathwaysB+ EvidenceA+ Formulation Logic
Acetyl L-Carnitine · 500 mg

Acetyl L-carnitine at 500 mg relates to cellular energy and acetylcholine production. These functions provide a plausible connection to cognition, while direct support for an immediate improvement in everyday focus remains limited.

How this product is rated for Mental Focus

Ingredient fit51

Focus-related ingredients sit within a broader formula containing ingredients for other purposes. Several relevant amounts are below the full reference levels or are undisclosed, limiting the overall dose contribution.
Goal fit
Focus-related ingredients sit within a broader formula containing ingredients for other purposes.
Dose adequacy
Several relevant amounts are below the full reference levels or are undisclosed, limiting the overall dose contribution.

Pathways40

The strongest saved connection is cerebral energy supply, with partial coverage. One assessed mechanism reaches the saved coverage threshold, so the focus support is relatively narrow.
Depth
The strongest saved connection is cerebral energy supply, with partial coverage.
Breadth
One assessed mechanism reaches the saved coverage threshold, so the focus support is relatively narrow.

Evidence83

Acetyl L-Carnitine provides the strongest evidence contribution among the ingredients meeting the saved amount criteria; that finding does not guarantee a focus benefit. The ingredients counted at relevant amounts match the preparations accepted by the saved assessment.
Evidence strength
Acetyl L-Carnitine provides the strongest evidence contribution among the ingredients meeting the saved amount criteria; that finding does not guarantee a focus benefit.
Studied preparation
The ingredients counted at relevant amounts match the preparations accepted by the saved assessment.

Formulation logic100

The counted ingredients can contribute independently or have their relevant partner present. No configured ingredient conflict was identified in the saved findings. All ingredients counted in this finding reach its minimum amount threshold.
Partner coverage
The counted ingredients can contribute independently or have their relevant partner present.
Conflicts
No configured ingredient conflict was identified in the saved findings.
Effective doses
All ingredients counted in this finding reach its minimum amount threshold.
Study evidence

Ingredients

IngredientAmount per servingScore
Calcium (Dibasic Calcium Phosphate)
23 mg
Acetyl L-Carnitine (Acetyl L-Carnitine HCl)
500 mg 90
Alpha-Lipoic Acid
150 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free Vegetarian
Report overview
A- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB Value
Each serving provides 500 mg of acetyl L-carnitine HCl. The whole-product price works out to about $0.33 per 500 mg of acetyl L-carnitine.
How this ingredient is rated

Active Ingredient Quality & Bioavailability88

Acetyl L-carnitine is the only carnitine form identified in the available facts. The available facts identify the HCl form and record no purity or manufacturing claim.
ALCAR vs. Standard Carnitine Form
Acetyl L-carnitine is the only carnitine form identified in the available facts.
Advanced Sourcing and Salt Specificity
The available facts identify the HCl form and record no purity or manufacturing claim.

Dose, Safety & Label Transparency100

Each serving contains 500 mg of acetyl L-carnitine, with its amount individually disclosed.
Clinical Dosage Efficacy
A serving provides 500 mg of acetyl L-carnitine.
Label Transparency and Proprietary Blends
The 500 mg amount of acetyl L-carnitine per serving is individually disclosed.

Value75

The whole-product price works out to about $0.33 per 500 mg of acetyl L-carnitine.
Price per 500mg Acetyl L-Carnitine
The whole-product price works out to about $0.33 per 500 mg of acetyl L-carnitine.
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 participantsBrain Health Cognitive Support forAcetyl L-Carnitine
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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 participantsLongevity forAcetyl L-Carnitine
  14. 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
  15. [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
  16. 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
  17. 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
  18. 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 Support forAcetyl L-Carnitine