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AMINO ACIDS

Acetyl-L-Carnitine (ALCAR)

Brain energy · focus · fat metabolism

STRONG EVIDENCEREAD THE RESEARCH
Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Last reviewed: May 30, 2026
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Acetyl-L-Carnitine: Brain energy · focus · fat metabolism. Brain-penetrating form of carnitine that supports cellular energy in neurons and may improve mental energy, focus, and mood in low-energy states. Standard dose 500 mg, taken in the morning, about $15/month. Evidence rating: strong evidence.

What is Acetyl-L-Carnitine?

Acetyl-L-Carnitine, often called ALCAR, is an acetylated form of L-carnitine that crosses the blood-brain barrier far more efficiently than its parent compound. Inside cells, carnitine shuttles long-chain fatty acids into mitochondria for energy production, supporting cellular ATP output in tissues with the highest energy demand, the brain, heart, and skeletal muscle. Clinical studies have explored ALCAR for mental energy, mild age-related cognitive decline, neuropathic discomfort, and mood support. Typical doses are 500-1,500 mg per day on an empty stomach. Benefits often build progressively over 4-8 weeks of consistent use.

WHY IT MATTERS

Brain-penetrating form of carnitine that supports cellular energy in neurons and may improve mental energy, focus, and mood in low-energy states.

Natural food sources

Where possible, get Acetyl-L-Carnitine from whole foods first. Common dietary sources include:

Red meat (beef, lamb)PorkPoultryDairy

Where to buy

Jarrow Formulas Acetyl L-Carnitine 500mg
RECOMMENDED
Jarrow Formulas, Acetyl-L-Carnitine
500 mg · Morning · ~$15/month

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Stacks that include Acetyl-L-Carnitine

☀
The Energy Stack
Steady output, no caffeine crashes.

Best for your goal

Interactions

Other amino acids

L-Theanine (Suntheanine)
Calm focus · stress
Glycine
Sleep depth · core body temperature
N-Acetyl Cysteine (NAC)
Liver · antioxidant · respiratory
Taurine
Heart · sleep · cellular hydration

Common questions

What is Acetyl-L-Carnitine?
Acetyl-L-Carnitine, often called ALCAR, is an acetylated form of L-carnitine that crosses the blood-brain barrier far more efficiently than its parent compound. Inside cells, carnitine shuttles long-chain fatty acids into mitochondria for energy production, supporting cellular ATP output in tissues with the highest energy demand, the brain, heart, and skeletal muscle. Clinical studies have explored ALCAR for mental energy, mild age-related cognitive decline, neuropathic discomfort, and mood support. Typical doses are 500-1,500 mg per day on an empty stomach. Benefits often build progressively over 4-8 weeks of consistent use.
What is Acetyl-L-Carnitine used for?
Brain energy · focus · fat metabolism. Brain-penetrating form of carnitine that supports cellular energy in neurons and may improve mental energy, focus, and mood in low-energy states.
What is the standard dose of Acetyl-L-Carnitine?
500 mg, typically taken in the morning. Approximate cost is $15 per month.
How strong is the evidence for Acetyl-L-Carnitine?
Strong evidence for its primary uses. See the full study list on the research page.

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