can l carnitine causes elevated tsh pubmed L-Carnitine | Linus Pauling Institute Thyroid hormone analogues and derivatives:
Description
Enhancement of activities relative to fatty acid oxidation in the liver of rats depleted of L-carnitine by D-carnitine and a gamma- butyrobetaine hydroxylase inhibitor

Fujihara KM, Zhang BZ, Jackson TD, Ogunkola MO, Nijagal B, Milne JV, et al

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and these are both further subcategorized by origin or associated syndromes, among other factors [219]
