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Head-to-head evidence comparison — which supplement is right for you?
Acetyl-L-Carnitine wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
8 of 11 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
2 of 2 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Acetyl-L-Carnitine and Shilajit have evidence — compare verdict strength side-by-side.
500-2000mg
Morning or early afternoon, With or without food
ALCAR powder or capsules
300-500mg purified extract
Morning, With or without food
Purified resin or PrimaVie extract
1-4 weeks
4-12 weeks
2-4 weeks
2-4 weeks
8-12 weeks
2-4 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.
Safety and efficacy of shilajit (mumie, moomiyo)
Phytotherapy research : PTR (2014) · Systematic review
Furthermore, animal and human data support its use as a 'revitalizer', enhancing physical performance and relieving fatigue with enhanced production of ATP.
Shilajit: a review
Phytotherapy research : PTR (2007) · Systematic review
It has been found to consist of a complex mixture of organic humic substances and plant and microbial metabolites occurring in the rock rhizospheres of its natural habitat.
Effects of 12 Weeks of Chromium, Phyllanthus emblica Fruit Extract, and Shilajit Supplementation on Markers of Cardiometabolic Health, Fitness, and Weight Loss in Men and Women with Risk Factors to Metabolic Syndrome Initiating an Exercise and Diet Intervention: A Randomized Double-Blind, Placebo-Controlled Trial
Nutrients (2025) · Rct · n=166
Methods: In total, 166 sedentary men and women with at least two markers of metabolic syndrome participated in a randomized, placebo-controlled, parallel-arm, and repeated-measure intervention study, of which 109 completed the study (48.6 ± 10 yrs., 34.2 ± 6 kg/m2, 41.3 ± 7% fat).
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 20% testosterone increase in healthy volunteers at 500mg for 90 days. Conservative estimate given systematic review found most testosterone boosters fail to increase levels. Limited to purified extracts only.
AI-estimated from published studies. Interpret as directional guidance.
Acetyl-L-Carnitine has a higher evidence score (9/10 vs 8/10) and wins in 3 of 3 categories.
For sharpen focus, Acetyl-L-Carnitine has a higher relevance score (80 vs 45).
No known interactions between Acetyl-L-Carnitine and Shilajit have been documented in our database. However, always consult a healthcare provider before combining supplements.