is longterm use of l-carnitine bad doesn't magically burn fat, it helps your body fat as energy. Combine it with training and consistency, and you'll feel the difference @Marybosch shows us how L-Carnitine will boost your Best Time to Take L-Carnitine:

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Supports Fat Metabolism & Energy L-Carnitine plays a key role in transporting fatty acids into cells to be used as energy

[DOI] [PMC free article] [PubMed] [Google Scholar] 35.Cross AJ, Leitzmann MF, Gail MH, Hollenbeck AR, Schatzkin A, Sinha R

NDCs escape digestion in the small intestine and reach the large intestine, becoming primary substrates for the gut microbiota

However, endogenous synthesis is insufficient to meet the metabolic requirement during gestation