recommended dose of l-carnitine (Carnipure®) capsules - 2000 mg per daily - 120 capsules L-Carnitine Supplements: Benefits, Dosage and
Description
[DOI] [PubMed] [Google Scholar] 257.Mahmoodi M., Hosseini R., Kazemi A., Ofori-Asenso R., Mazidi M., Mazloomi S.M

One example is Applied Nutrition L-Carnitine, which supports fat oxidation and energy conversion during workouts

More recently, a 2018 study by Chen et al

Am J Clin Nutr 78(1):36

Available online: 39.Bene J., Hadzsiev K., Melegh B
