Also known as: Carnitine, Acetyl-L-Carnitine, ALCAR
L-Carnitine is an amino acid derivative essential for transporting long-chain fatty acids into mitochondria for energy production. It supports fat metabolism, exercise recovery, and cognitive function in its acetylated form (ALCAR).
L-Carnitine is synthesized from the amino acids lysine and methionine primarily in the liver and kidneys. Its principal biological role is shuttling long-chain fatty acids across the inner mitochondrial membrane via the carnitine palmitoyltransferase (CPT) system, a rate-limiting step in beta-oxidation. Without sufficient carnitine, the body cannot efficiently burn fat for fuel. Acetyl-L-Carnitine (ALCAR) is a form that crosses the blood-brain barrier and may support neuroprotection, acetylcholine synthesis, and mitochondrial function in neurons. Clinical research has examined L-Carnitine in cardiovascular disease, peripheral artery disease, male infertility, and age-related cognitive decline. Deficiency is rare in healthy individuals but can occur in vegetarians, older adults, and patients on dialysis or certain medications.
L-Carnitine facilitates fatty acid transport into mitochondria, which is essential for energy production via beta-oxidation. Supplementation may enhance fat utilization during exercise.
Several trials show L-Carnitine supplementation reduces markers of muscle damage (CK, myoglobin) and muscle soreness after resistance exercise.
With a carbohydrate-containing meal to enhance muscle uptake
Muscle carnitine stores take weeks to increase; consistent use for 12+ weeks recommended.
Morning, with or without food
ALCAR crosses the blood-brain barrier; prefer this form for neurological benefits.
Exercise performance and recovery
Cognitive function and neuroprotection
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