different kinds of l-carnitine | Linus Pauling Institute L-Carnitine: Benefits, Side Effects, FAQ,
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10.1016/j.jpsychores.2005.06.081

People who are pregnant or breastfeeding, have thyroid or kidney problems, or are taking medications that may not mix well with L-carnitine should avoid it unless advised by a doctor

And if we can't increase carnitine in the muscle with a supplement and we can't get it into the mitochondria, it can not exert its claimed effects

Sci Rep 14 , 16444 (2024)

2004Nov;1033:1-16.doi: 10.1196/annals.1320.001
