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doi:10.1016/bs.pbr.2021.01.028

J Clin Endocrinol Metab 42: 125131, 1976 [DOI] [PubMed] [Google Scholar] 48.Coulombe P, Dussault JH, Walker P

Individuals with defective carnitine transport have poor intestinal absorption of dietary L-carnitine, impaired L-carnitine reabsorption by the kidneys (i.e., increased urinary loss of L-carnitine), and defective L-carnitine uptake by muscles (4)

The additional carbohydrate, and the requirement to specifically be timed with the carnitine supplement twice daily, is unlikely to align with the caloric needs and nutrient timing that is optimal for each athlete, during each phase of training, over the period of supplementation

those with the best evidence of potential benefit include magnesium, coenzyme Q10 (CoQ10), vitamin D, and melatonin