Acetyl-L-Carnitine
amino acids
Acetyl-L-Carnitine (ALCAR) is an acetylated form of the amino acid L-carnitine that crosses the blood-brain barrier more effectively than standard L-carnitine. It plays a crucial role in mitochondrial energy production and cognitive function. This supplement is particularly valued for its neuroprotective and nootropic properties.
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Benefits
Dosage
Typical Dose
1,500–3,000 mg daily
Upper Limit
4,000 mg daily
Timing
500–1,000 mg with meals, 2–3 times daily; morning dosing preferred for cognitive benefits
Forms & Bioavailability
Acetyl-L-Carnitine HCl (powder/capsules)
95%
Acetyl-L-Carnitine tartrate
90%
Liquid acetyl-L-carnitine
92%
Side Effects
Interactions
Research Summary
Clinical studies demonstrate that acetyl-L-carnitine improves cognitive function, attention, and memory in both healthy individuals and those with age-related decline. Research supports its use in neurodegenerative conditions such as Alzheimer's disease and Parkinson's disease, showing modest neuroprotective effects. Evidence also supports benefits for mood disorders, particularly depression, and for physical performance in endurance athletes and ageing populations.
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The Bottom Line on Acetyl-L-Carnitine
Acetyl-L-Carnitine is well-researched with strong evidence supporting its primary benefits.It is most commonly used for enhances cognitive function and mental clarity and supports mitochondrial energy production and atp synthesis. As with any supplement, individual results vary. Start with the lower end of the dosage range and assess for 4-8 weeks before adjusting.
About Our Research
This profile is compiled from peer-reviewed research published on PubMed, the NIH Office of Dietary Supplements, and established nutritional science databases. Dosages reflect clinically-studied amounts from human trials where available. We update profiles as new research emerges. This is not medical advice — consult a healthcare professional before supplementing.
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Goal Guides for Acetyl-L-Carnitine
See how Acetyl-L-Carnitine can help with specific health goals: