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Description
At present, there is no test that assesses functional carnitine deficiency in humans (6)

Efficacy of levo carnitine and alpha lipoic acid in ameliorating the decline in mitochondrial enzymes during aging

Pucci, S
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Effect on cardiac ischemia and cardiac outcomes L-carnitines theoretical benefit in improving clinical outcomes, particularly after ischemic events and cardiac surgeries, is well-established

(PubMed) Iyer R, Gupta A, Khan A, Hiremath S, Lokhandwala Y

It is generally best taken with food to enhance absorption and minimize stomach upset
