l carnitine causes depression Study links to low blood levels of acetyl-L-carnitine Carnitine Deficiency: What Is It,

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Helps improve endurance, reduce muscle fatigue and support workout recovery

The demonstration that its availability can be readily manipulated in humans, and impacts on physiological function, will result in renewed business and scientific interest in this compound...However, research over the past decade has shed new light on the importance of carnitine as a regulator of skeletal muscle fuel selection and physiological function. Ferreira GC and McKenna MC, L-Carnitine and Acetyl-L-carnitine Roles and Neuroprotection in Developing Brain. in Neurochemical Research , Volume 42, Issue 6, June 2017, pp 1661 - 1675

You must avoid eating, drinking, or smoking for at least 30 minutes after using it