PlainPill

ALCAR (acetyl-L-Carnitine)

People mainly take ALCAR (acetyl-L-Carnitine) for focus, energy, performance. Based on 7 first-hand reports and 38 meta-analyses & systematic reviews in the medical literature. Ranked #980 of 1,974 overall.

14
User score
Mixed
14% positive14% mixed0% negative71% unclear

Of reports that state an outcome, 50% are positive.

Clinical research
BModerate research base
38
meta-analyses
0
RCTs
0
papers

What ALCAR (acetyl-L-Carnitine) does, according to users

Of the people who reported each effect, the share who said it got better.

What the research says

Systematic reviews and meta-analyses from PubMed, with their published conclusions.

BModerate research base

At least one meta-analysis, or 5+ randomized controlled trials. The grade measures how much human research exists — read the conclusions below for what it found.

Nutrients · 2020 · Meta-analysis / systematic review
Nutritional Interventions in the Management of Fibromyalgia Syndrome

Conclusion: These results may suggest that weight loss, together with the psychosomatic component of the disease, should be taken into account. Therefore, although dietary aspects appear to be a promising complementary approach to the treatment of FM, further research is needed to provide the most effective strategies for the management of FM.

PubMed 32825400 ↗
Nutrients · 2020 · Meta-analysis / systematic review
Dietary Interventions in the Management of Fibromyalgia: A Systematic Review and Best-Evidence Synthesis

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 ↗
Cochrane Database Syst Rev · 2003 · Meta-analysis / systematic review
Acetyl-L-carnitine for dementia

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 ↗

Dosage people report

As stated by users — not a recommendation. Follow the label or your doctor.

500mgas reported
200-300 mgdaily

Reported side effects

How often each side effect came up across all reports.

low mood ×1heartburn ×1

What users say

Verbatim quotes, shortened only — each links to the original discussion.

“ALCAR 500 mg”
Source discussion ↗
“ALCAR does the same thing [as lion's mane regarding NGF].”
Source discussion ↗
“I take 200-300mg of Alcar, and 50-80mg of cdp. After 5mins my brain feels like it's being charged up”
Source discussion ↗
Top discussions (3)

Other options for focus

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