l.carnitine side effects L-Carnitine: Uses, Effects, Interactions, Dosage and Supplements What are the adverse effects
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Dixon MA, Leonard JV
Circulation 111:465471
During vigorous muscle contraction or during fasting, ATP concentration decreases and AMP concentration increases leading to the activation of AMP-activated protein kinase (AMPK)

The latest research indicates that 550mg daily is required [9]