Carnitine · L-Carnitine Tartrate · LCLT
Shuttles fatty acids into mitochondria — critical for fat oxidation and recovery.
FDA
Approved
WADA
Not Listed
HALF-LIFE
~17 hours
ROUTE
Oral / IV
SCHEDULE
Daily, pre-workout or with meals
In Plain English
Shuttles fatty acids into mitochondria — critical for fat oxidation and recovery.
Status & Legality
What do these mean?Fatty acid transport
Fat oxidation
Exercise recovery
Cardiovascular support
L-Carnitine is an amino acid derivative that transports long-chain fatty acids across the mitochondrial membrane for beta-oxidation. Without adequate carnitine, fats cannot enter the mitochondria and accumulate instead. It is conditionally essential — synthesized endogenously but often insufficient during high-output exercise, caloric restriction, or aging. Carnitine Tartrate (LCLT) is preferred for athletic use; Acetyl-L-Carnitine (ALCAR) crosses the blood-brain barrier for cognitive benefits.
Fishy body odor at high doses (gut bacteria metabolize it to TMAO)
Nausea
GI cramping at high doses
Mild headache
Taking without carbohydrates — insulin is required for carnitine muscle uptake; absorption into muscle tissue drops significantly without a carbohydrate-containing meal
Confusing L-Carnitine Tartrate and ALCAR — LCLT is for athletic and fat oxidation performance; ALCAR crosses the blood-brain barrier for cognitive and neurological benefits
Expecting immediate fat loss — tissue carnitine levels require 4+ weeks of daily supplementation to build to functional levels
Thyroid hormones — L-Carnitine inhibits cellular uptake of thyroid hormones; potential concern for hypothyroid patients
Blood thinners — mild antiplatelet effect at high doses; monitor
D-Carnitine — if supplements contain D-Carnitine (contamination or poor quality), it competitively inhibits L-Carnitine uptake; verify supplement quality
L-Carnitine works but requires patience and consistency — tissue levels take 4+ weeks to build. The insulin-dependent uptake mechanism means taking it with a carbohydrate-containing meal is not optional; it's how carnitine gets transported into muscle. If cognition is the primary goal, switch to ALCAR — the acetylated form that crosses the blood-brain barrier.
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Stats
Sources & Studies
Koozehchian MS. et al., J Exerc Nutrition Biochem, 2018