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Head-to-head evidence comparison — which supplement is right for you?
Acetyl-L-Carnitine and Methylfolate are closely matched across evidence, studies, and safety.
Verdict
Likely helps
10 of 13 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
14 of 16 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Acetyl-L-Carnitine and Methylfolate have evidence — compare verdict strength side-by-side.
500-2000mg
Morning or early afternoon, With or without food
ALCAR powder or capsules
400-800mcg daily
Morning with or without food, Consistent daily timing
L-Methylfolate (5-MTHF)
1-4 weeks
4-12 weeks
2-4 weeks
2-4 weeks
1-3 weeks
4-8 weeks
Days to weeks
Acetyl-L-carnitine for the treatment of diabetic peripheral neuropathy
The Cochrane database of systematic reviews (2019) · Meta analysis · n=907
The risk of bias was high in both trials of different ALC doses and low in the other two trials.No included trial measured the proportion of participants with at least moderate (30%) or substantial (50%) pain relief.
Impact of Dietary Supplements on Clinical Outcomes and Quality of Life in Patients with Breast Cancer: A Systematic Review
Nutrients (2025) · Systematic review · n=45
Curcumin studies presented mixed results.
Effects of Carnitine and Coenzyme Q10 on Sperm Quality and Pregnancy Rates in Men with Unexplained Infertility: A Systematic Review and Network Meta-Analysis
Reproductive sciences (Thousand Oaks, Calif.) (2025) · Meta analysis
L-carnitine, coenzyme Q10 and L-carnitine + acetyl-L-carnitine significantly improved sperm quality parameters compared with placebo.
Efficacy of B-vitamins and vitamin D therapy in improving depressive and anxiety disorders: a systematic review of randomized controlled trials
Nutritional neuroscience (2023) · Systematic review · n=2256
Systematic review examining Methylfolate efficacy
Systematic Review and Meta-Analysis of L-Methylfolate Augmentation in Depressive Disorders
Pharmacopsychiatry (2022) · Meta analysis · n=6707
In the meta-analysis of categorical Hamilton Rating Scale for Depression-17 response, (three studies, N=483) adjunctive L-methylfolate was associated with a small effect versus antidepressant monotherapy (relative risk: 1.25, 95% confidence interval [CI]=1.08 to 1.46, p=0.004).
Folic acid/methylfolate for the treatment of psychopathology in schizophrenia: a systematic review and meta-analysis
Psychopharmacology (2018) · Meta analysis · n=925
Pooled FA + AP treatments were more effective than placebo + AP for negative symptoms (N = 5, n = 281; SMD = -0.25, 95% CI = -0.49, -0.01, p = 0.04, I2 = 0%).
Based on meta-analysis of 523 participants showing moderate effect (VAS reduction 1.20 points). High risk of bias noted in some trials. Effect size is conservative given study limitations.
Based on meta-analysis showing small effect size for adjunctive L-methylfolate. RCT showed efficacy at high doses but effectiveness appears modest. Risk increases with higher doses due to overmethylation symptoms.
AI-estimated from published studies. Interpret as directional guidance.
Both Acetyl-L-Carnitine and Methylfolate are closely matched — the best choice depends on your specific health goals.
For fertility support, Methylfolate has a higher relevance score (95 vs 85).
No known interactions between Acetyl-L-Carnitine and Methylfolate have been documented in our database. However, always consult a healthcare provider before combining supplements.