Acetyl-L-Carnitine (ALCAR)New
Acetyl-L-carnitine (ALCAR) is the acetylated form of carnitine, able to cross the blood-brain barrier more readily than plain L-carnitine. Randomized trials and meta-analyses support its use for diabetic peripheral neuropathy (e.g., the AGATHA study) and for depression in older adults, where a meta-analysis found benefits comparable to standard antidepressants in some trials. Evidence for cognitive enhancement in healthy, non-elderly adults is weaker and more mixed, and a widely cited Cochrane review of cognitive benefit in mild cognitive impairment has been criticized for relying on smaller, older, industry-associated trials.
Mechanism of Action
ALCAR shuttles fatty acids across the mitochondrial membrane as part of the carnitine shuttle, supporting mitochondrial beta-oxidation and ATP production, particularly in neurons and skeletal muscle. The acetyl group it carries can also be donated to acetyl-CoA and used in acetylcholine synthesis, which may underlie its effects on mood and peripheral nerve function; in diabetic neuropathy, proposed mechanisms include improved nerve regeneration and reduced oxidative damage to peripheral nerves.
Dosing Protocol
500-1000mg twice dailymg
Standard starting dose based on research
Therapeutic Range
500
Minimum
3000
Maximum
Morning and early afternoon (may be stimulating)
Dosages are general guidelines. Individual requirements vary based on body weight, health status, and specific goals. Start with lower doses and adjust based on response.
Benefits
Primary Benefits
- Mitochondrial energy support
- Nerve health
- Mood support
- Cognitive support (older adults)
Secondary Benefits
Safety Information
Contraindications
Do not use if any of the following apply:
- •Seizure disorders (theoretical)
- •Hyperthyroidism
Drug/Supplement Interactions
May interact with the following. Consult a healthcare provider before combining:
Potential Side Effects
Some users may experience:
This is not a complete list of interactions or side effects. Individual responses vary. Always start with the lowest effective dose and monitor your response. Report any adverse effects to your healthcare provider.
Quality Markers
Look for these specific quality indicators when sourcing this compound:
- Pharmaceutical-grade ALCAR (not blended L-carnitine tartrate)
- Third-party tested for purity
Trusted Certifications
Note: Supplement quality varies dramatically between brands. Cheap supplements often contain fillers, incorrect doses, or contaminants. Investing in quality products from reputable manufacturers is essential for safety and efficacy.
Evidence Profile
Evidence Score
6/10
Moderate Evidence
Some clinical trials with positive results, emerging research
Evidence Scale
8-10
Strong
5-7
Moderate
1-4
Emerging
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