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n acetyl l carnitine vs acetyl l carnitine The difference between L-Carnitine and L-Carnitine (ALCAR) Acetylcarnitine - Wikipedia
Description
ALA acts as a cofactor for pyruvate dehydrogenase (PDH), activating it and inhibiting pyruvate dehydrogenase kinase
Miller, E

Iwaki M, Matsuda M, Maeda N, Funahashi T, Matsuzawa Y, Makishima M, et al

For athletic performance, carnitine use has been shown to increase stress resistance, help burn fat faster, and prevent muscle loss

[DOI] [PubMed] [Google Scholar] 636

The manufacturing process can also introduce impurities like bacteria or heavy metals into peptide drugs
