L-Carnitine
Also known as: Levocarnitine, Carnitine
Effective Dosage
500-2000 mg daily
✓ What the Science Says
L-Carnitine is primarily known for its role in fatty acid metabolism, helping to transport fatty acids into the mitochondria for energy production. It has been shown to improve exercise performance and recovery in some studies, particularly in endurance activities.
✗ What It Doesn't Do
L-Carnitine is often marketed as a weight loss miracle or a muscle-building supplement, but there is no strong evidence to support these claims. It does not directly lead to fat loss or muscle gain without a proper diet and exercise regimen.
Evidence-Based Benefits
L-Carnitine is primarily known for its role in fatty acid metabolism, helping to transport fatty acids into the mitochondria for energy production. It has been shown to improve exercise performance and recovery in some studies, particularly in endurance activities.
Strong EvidenceEffective at: 500-2000 mg daily
Source: PubMed, NIH DSLD
Absorption & Bioavailability
Good - L-Carnitine is well absorbed in the gastrointestinal tract, but individual absorption can vary.
Red Flags to Watch For
- 🚩 Beware of products claiming miraculous weight loss effects.
- 🚩 Watch for overly high doses that exceed typical study dosages.
Products Containing L-Carnitine
See how L-Carnitine is used in these analyzed products:
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: 2026-02-04