Studies show less than 10% reaches systemic circulation due to degradation by peptidases in the small intestine
Aldawsari M, Almadani FA, Almuhammadi N, Algabsani S, Alamro Y, Aldhwayan M
The sublingual and buccal mucosa offer unique advantages for systemic drug delivery, including extensive vascularization and thin epithelial layers, which allow rapid absorption and partial avoidance of first-pass metabolism in the liver
doi: 10.1331/JAPhA.2009.09078
Research demonstrates that acetyl-L-carnitine ameliorates insulin resistance through multiple mechanisms: restoring tissue carnitine levels in skeletal muscle and myocardium, improving mitochondrial -oxidation of fatty acids to reduce accumulation of lipotoxic intermediates, enhancing glucose disposal and oxidation capacity, and reducing inflammatory signaling that impairs insulin receptor function