l carnitine cause seizures Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health L-Carnitine Side Effects & Safety:

Unlike symptomatic treatments (gabapentinoids, duloxetine), ALC promotes actual nerve fiber regeneration and addresses underlying pathophysiology.[17][2] This disease-modifying potential makes it particularly valuable for early intervention

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Carnitine plays a critical role in energy production by transporting long-chain fatty acids into the mitochondria, where they undergo beta-oxidation to produce adenosine triphosphate (ATP) [1][3]

Furthermore, some supplements marketed for "thyroid support" contained actual thyroid hormones , which can pose a risk if the hormone amounts are less or more than needed

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Endogenous plasma and tissue concentrations of carnitines are preserved at relatively precise limits to facilitate mitochondrial and peroxisomal fatty acid oxidation (Bremer 1983, Reuter & Evans 2012)