dl carnitine vs l carnitine Functional differences between l- and d-carnitine in metabolic regulation evaluated using a low-carnitine Nile tilapia model | British Journal of Nutrition Carnitine: the claims and why
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doi:10.1007/s44192-023-00056-z

Vockley J, Bennett M, Gillingham M

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Hence, it remains unclear whether obesity-associated glycine deficiency can be corrected using dietary glycine supplements and whether this correction would result in similar metabolic benefits