Acetyl-L-Carnitine (ALCAR)
Nootropic
Also known as: ALC, Acetyl L-Carnitine HCl, ALCAR, Acetyl-L-Carnitine, L-Acetylcarnitine
B
Grade B💊 500-2000 mg daily🎯 8 primary uses🔗 2 synergies⚠️ Review warnings
Levels upBrain & Focus+50 pts
Overview
Acetyl L-Carnitine is a form of carnitine that crosses the blood-brain barrier and supports mitochondrial energy production and acetylcholine synthesis. It has shown modest benefits for cognitive function and energy metabolism in some studies, with stronger evidence in elderly populations and carnitine-deficient states.
Primary Uses
Brain energyMemoryNeuroprotectionMoodCognitive supportEnergy and fatigueBrain health and neuroprotectionAge-related cognitive decline
Frequently Asked About Acetyl-L-Carnitine (ALCAR)
How much Acetyl-L-Carnitine (ALCAR) should I take?
The typical effective range is 500-2000 mg daily. Individual needs vary based on age, body weight, diet, and goals — start at the lower end and adjust based on response. Always consult a healthcare provider before starting a new supplement.
When is the best time to take Acetyl-L-Carnitine (ALCAR)?
Morning (mildly stimulating). Consistency matters more than perfect timing — pick a daily anchor (e.g. with breakfast or before bed) and stick with it.
Should I take Acetyl-L-Carnitine (ALCAR) with food?
Optional.
Does Acetyl-L-Carnitine (ALCAR) interact with medications?
Yes — known interactions include Blood thinners and Thyroid meds. If you take any prescription medication, talk to your doctor or pharmacist before starting Acetyl-L-Carnitine (ALCAR).
What does Acetyl-L-Carnitine (ALCAR) pair well with?
Acetyl-L-Carnitine (ALCAR) stacks well with Alpha-lipoic acid and CoQ10 — these combinations either improve absorption or work synergistically toward common goals.
Who should not take Acetyl-L-Carnitine (ALCAR)?
Acetyl-L-Carnitine (ALCAR) should be avoided or used with caution by people with Seizure disorders (caution). Pregnant or breastfeeding women should consult a healthcare provider before use.
What are the side effects of Acetyl-L-Carnitine (ALCAR)?
Most people tolerate Acetyl-L-Carnitine (ALCAR) well. The most commonly reported side effects are GI upset, Fishy odor, and Insomnia if late. Side effects are usually dose-dependent — lowering the dose often resolves them.
Dosage
Typical range
500-2000 mg daily
Timing
Morning (mildly stimulating)
With food
Optional
Duration
Safe long-term
Special Populations
Cognitive aging, depression
Research & Studies
Landmark clinical studies on Acetyl-L-Carnitine (ALCAR). Each title links to a plain-English breakdown — what the study shows, what its limitations are, and how to read around them.
- Acetyl-L-carnitine for the treatment of mild cognitive impairment and mild Alzheimer's disease: a meta-analysis of clinical trialsMontgomery SA, Thal LJ, Amrein R · 2003 · International Clinical PsychopharmacologyMeta-analysisPubMed ↗
Meta-analysis of 21 double-blind RCTs found ALCAR significantly improved cognition vs placebo in mild cognitive impairment and early Alzheimer's, with effect size growing over time.
- Acetyl-L-carnitine for the treatment of diabetic peripheral neuropathy: a long-term, randomised, double-blind, placebo-controlled study
52-week RCT (n=1,257) found ALCAR 1000mg three times daily improved vibration perception, sural nerve fiber regeneration, and pain scores in diabetic peripheral neuropathy.
Browse all curated studies →
Mechanism of Action
- • Crosses BBB
- • Acetyl donor for acetylcholine
- • Supports mitochondrial function in brain
Evidence Quality
Evidence Grade B
Brain-penetrating carnitine
Safety & Contraindications
Serious Warnings
- • None significant
Contraindications
- • Seizure disorders (caution)
Common Side Effects
- • GI upset
- • Fishy odor
- • Insomnia if late
Pregnancy & Breastfeeding
Consult healthcare provider
Liver & Kidney Notes
Safe
Interactions
💊 Medications
- • Blood thinners
- • Thyroid meds
🧪 Supplements
- • Works with ALA
🍽️ Food & Alcohol
- • No interactions
Stacking & Synergies
Pairs Well With
Avoid Combining With
None
Best Goal Synergies
Brain agingEnergy
Buying Guide
What to Look For
- • Quality source
Standardization Markers
ALCAR content
Adulteration risk
Low
Practical Notes
- • Mildly stimulating - morning use
- • Good for aging brain
Tags
nootropicenergyacetylcholineneuroprotectionmitochondrial-supportcognitive-functionenergy-metabolismblood-brain-barrier-penetrant
Top Products with Acetyl-L-Carnitine (ALCAR)
Highest-scored catalog products containing Acetyl-L-Carnitine (ALCAR), ranked by our scoring engine.
Acetyl L-Carnitine HCL (ALCAR) CapsulesNootropics Depot94
Acetyl L-Carnitine PowderNutricost94
Acetyl L-Carnitine ALCAR PowderNootropics Depot94
Acetyl-L-CarnitineThorne92
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Last reviewed: September 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.
Cite this page
Formulate Research Team. (2026, September). Acetyl-L-Carnitine (ALCAR) — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/acetyl-l-carnitine
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.