Conclusion: There is evidence for benefit of ALC on clinical global impression, but there was no evidence using objective assessments in any other area of outcome. Given the large number of comparisons made, the statistically significant result may be due to chance. At present there is no evidence to recommend its routine use in clinical practice. Although the intention of the review was to access ALC for the treatment of all dementias, the included trials had confined themselves to participants with Alzheimer's disease. Individual patient data may add to the findings, as would trials including other type
PubMed 12804452 ↗Acetyl-L-Carnitine
People mainly take Acetyl-L-Carnitine for energy, mood, focus. Based on 103 first-hand reports and 46 meta-analyses & systematic reviews in the medical literature. Ranked #300 of 1,974 overall.
Of reports that state an outcome, 58% are positive.
What Acetyl-L-Carnitine does, according to users
Of the people who reported each effect, the share who said it got better.
4 more with fewer than 3 reports
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
3+ meta-analyses or systematic reviews and 10+ randomized controlled trials in humans. The grade measures how much human research exists — read the conclusions below for what it found.
Conclusion: CA Cancer J Clin 2017;67:194-232. © 2017 American Cancer Society.
PubMed 28436999 ↗Conclusion: Interpretation of these studies was limited due to the frequent poor quality of the study design, the wide heterogeneity between studies, the small sample size and a high degree of bias. Therefore, there is insufficient evidence to recommend any one particular nutritional intervention for the management of fibromyalgia and further research is needed.
PubMed 32878326 ↗Conclusion: Based on the current data and clinician input, a range of nutraceuticals and phytoceuticals were given either a supportive recommendation or a provisional recommendation across a range of various psychiatric disorders. However several had only a weak endorsement for potential use; for a few it was not possible to reach a clear recommendation direction, largely due to mixed study findings; while some other agents showed no obvious therapeutic benefit and were clearly not recommended for use. It is the intention of these guidelines to inform psychiatric/medical, and health professional practice
PubMed 35311615 ↗Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
Reported side effects
How often each side effect came up across all reports.
What users say
Verbatim quotes, shortened only — each links to the original discussion.
“You should have noticeably better cognitive benefits with ALCAR.”
“I took Acetyl L-Carnatine twice a day for a couple of weeks. It made me fell depressed and sad. First day I stopped the L-Canatine the blues evaporated.”
“Acetyl-L-Carnitin (~500mg - 1g a day)”
“acetly l carnitine”
“Acetyl L-Carnitine - Daily”
Top discussions (5)
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- I Organized Andrew Huberman's Complete Supplement List by Category ↗
Other options for energy
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate