Endurance
L-Carnitine (L-Carnitine L-Tartrate)
Also known as: LCLT · L-Carnitine L-Tartrate · Acetyl-L-Carnitine (different form)
Transports long-chain fatty acids into mitochondria for beta-oxidation. Deficiency is common in vegetarians. LCLT form has the best exercise performance evidence.
Effective Dose
1–3g / day
per clinical evidence
Evidence Level
Moderate
Endurance
Mechanism
Long-chain fatty acid mitochondrial transport
primary action
Best For
Fat oxidation
Recovery, Cardiac health, Vegetarians
This profile is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications.
What Is L-Carnitine (L-Carnitine L-Tartrate)?
L-carnitine is synthesised from lysine and methionine in the liver and kidneys, and is found almost exclusively in animal foods (particularly red meat). It is essential for transporting long-chain fatty acids across the inner mitochondrial membrane for beta-oxidation. Vegetarians and vegans have significantly lower tissue carnitine and benefit most from supplementation.
How It Works: The Science
Carnitine acyltransferases (CAT-I and CAT-II) convert long-chain acyl-CoA to acylcarnitine, transport it across the mitochondrial membrane, and regenerate acyl-CoA for beta-oxidation. This regulates the acyl-CoA/CoA ratio in the cytosol. L-carnitine L-tartrate (LCLT) has been specifically studied for reducing exercise-induced muscle damage and improving recovery.
Primary Mechanism
Long-chain fatty acid mitochondrial transport
Evidence-Based Benefits
Dosage Guide
Effective Dose
1–3g / day
2–3g LCLT/day, ideally co-ingested with carbohydrate (to raise insulin and drive carnitine into muscle). Standard supplementation takes weeks to increase muscle carnitine stores — effects are not acute. For ALCAR (Acetyl-L-Carnitine), see the cognitive profile.
Safety Profile & Side Effects
Generally safe. High doses (>3g/day) can increase TMAO (a cardiovascular risk marker) via gut bacteria metabolism — relevant context for those with pre-existing cardiovascular disease. Distinct from ALCAR, which has different pharmacology.
Who Should (and Shouldn't) Take It
Vegetarians, vegans, endurance athletes, and older individuals. Modest but real benefit for recovery. Do not expect dramatic acute effects — carnitine is a long-term muscle store supplement.
Frequently Asked Questions
Related Ingredients
Medical Disclaimer
Ingredient profiles are for informational purposes only and do not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications. Full disclaimer →