Last verified: 17 days ago
Acetyl L-Carnitine
Also known as: ALCAR, Acetyl-L-Carnitine, ALC, N-Acetyl Carnitine
Evidence under review. — Not yet rated
Amino acid derivative that supports mitochondrial energy and antioxidant defense. Evidence is mixed and mostly preliminary.
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What it does
Acetyl L-Carnitine (ALCAR) is a naturally occurring compound that helps shuttle fatty acids into mitochondria for energy production. The provided research suggests it has antioxidant and...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose from provided studies
What the Science Says
Acetyl L-Carnitine (ALCAR) is a naturally occurring compound that helps shuttle fatty acids into mitochondria for energy production. The provided research suggests it has antioxidant and anti-inflammatory properties, with exploratory evidence for roles in PCOS management, colorectal cancer inhibition in lab models, and as an adjunct in certain poisoning scenarios. It is also being studied as a biomarker in neurological conditions like ALS. Most human evidence comes from small trials or combination supplement studies, making it difficult to isolate ALCAR's specific effects.
What It Doesn't Do
Not proven to boost athletic performance — one study found no improvement in anaerobic or aerobic performance in trained cyclists. Not shown to increase pregnancy rates in IVF. No strong evidence it improves cognition on its own. Not a proven cancer treatment. Don't expect dramatic results from taking it solo.
Evidence-Based Benefits
May improve metabolic and hormonal markers in women with PCOS when combined with L-Arginine and CoQ10.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Acts as an antioxidant that may reduce oxidative stress markers in several experimental models.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
May support mitochondrial function as an add-on therapy in certain drug poisonings like organophosphates and aluminum phosphide.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown from provided studies — no pharmacokinetic data reported in the provided papers
Red Flags to Watch For
- ALCAR is metabolized into TMAO (trimethylamine N-oxide) via gut bacteria — elevated TMAO has been linked to cardiovascular risk and was observed in ALS patients taking ALCAR
- Most human studies in the provided data used ALCAR in combination with other supplements, making it impossible to attribute effects to ALCAR alone
- Animal and cell-line data (zebrafish, colorectal cancer cells) cannot be directly extrapolated to human benefits
- No standardized dosing established from the provided clinical evidence
Products Containing Acetyl L-Carnitine
See how Acetyl L-Carnitine is used in these analyzed products:
Frequently Asked Questions
What does Acetyl L-Carnitine do?
Amino acid derivative that supports mitochondrial energy and antioxidant defense. Evidence is mixed and mostly preliminary.
What is the effective dose of Acetyl L-Carnitine?
No established dose from provided studies
Is Acetyl L-Carnitine safe?
ALCAR is metabolized into TMAO (trimethylamine N-oxide) via gut bacteria — elevated TMAO has been linked to cardiovascular risk and was observed in ALS patients taking ALCAR
What doesn't Acetyl L-Carnitine do?
Not proven to boost athletic performance — one study found no improvement in anaerobic or aerobic performance in trained cyclists.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25