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In addition, it has been difficult to compare the effects of l- and d-carnitine supplementation, because it has not been possible to eliminate the background of endogenous l-carnitine in vivo

doi: 10.1016/s0024-3205(03)00609-x

[DOI] [PMC free article] [PubMed] [Google Scholar] 579.Amir Shaghaghi M., Zhouyao H., Tu H., El-Gabalawy H., Crow G.H., Levine M., Bernstein C.N., Eck P

Protective humoral immunity in SARS-CoV-2 infected pediatric patients

But they do reinforce a useful principle
