Ingredients · Acetyl-L-Carnitine · Research
Clinical research

What does the research say about Acetyl-L-Carnitine?

strong evidence

Acetyl-L-carnitine (ALCAR) is a mitochondrial carrier compound that crosses the blood-brain barrier. Strongest evidence is for diabetic neuropathy, age-related cognitive decline, and mental fatigue.

Best-evidenced use cases
  • Diabetic peripheral neuropathy
  • Age-related mental fatigue
  • Mild cognitive impairment
  • Depression in older adults
  • Recovery from physical fatigue

3 key studies

Search PubMed for more
  • 01RCT2005Diabetes Care

    Acetyl-L-carnitine and diabetic neuropathy

    Sima et al.
    Sample
    1,257 patients with diabetic neuropathy
    Dose
    1,000-3,000 mg/day
    Duration
    52 weeks
    Key finding

    ALCAR significantly improved nerve fiber regeneration, vibration perception, and pain scores in diabetic neuropathy vs placebo.

    Read on PubMed
  • 02Meta-analysis2018Pharmacological Research

    ALCAR and mental fatigue: meta-analysis

    Malaguarnera et al.
    Sample
    Multiple RCTs reviewed
    Dose
    1,500-3,000 mg/day
    Duration
    6-12 weeks
    Key finding

    ALCAR significantly reduced physical and mental fatigue scores in older adults, post-illness recovery, and chronic fatigue syndromes.

    Read on PubMed
  • 03Meta-analysis2003International Clinical Psychopharmacology

    ALCAR in mild cognitive impairment and Alzheimer's

    Montgomery et al.
    Sample
    21 RCTs
    Dose
    1,500-3,000 mg/day
    Duration
    3+ months
    Key finding

    ALCAR produced significant improvements in cognitive function scales in mild cognitive impairment and early Alzheimer's vs placebo.

    Read on PubMed
How we read the research

We prioritize randomised controlled trials and meta-analyses over single observational studies. Animal and in-vitro data are listed as "mechanistic", they suggest direction, not human effect size.

What we don't do

We don't cherry-pick favourable studies, omit conflicting evidence, or cite industry-funded trials without flagging the conflict of interest where known.

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Studies referenced are real published research. Summaries are paraphrased for accessibility, for exact methods and full text, click through to PubMed. Educational use only, not medical advice. Consult a qualified clinician before starting any new supplement.