l-carnitine hormone supplementation at doses of 2–4 g/day has been shown in a randomized, double-blind, placebo-controlled trial by Salvatore Benvenga to reverse and prevent symptoms of iatrogenic hyperthyroidism in women receiving TSH-suppressive levothyroxine L-Carnitine Benefits for PCOS: Weight

So if you eat meat, youre very likely to get enough of your L-carnitine needs

Efficacy and safety of leucine supplementation in the elderly

Recently the debate has been stimulated by a cultural shift towards vegetarianism, which frames red meat consumption as damaging to ones health

This enzyme metabolizes some dietary ingredients, such as choline, and other choline-containing compounds (phosphatidylcholine/lecithin, phosphocholine, sphingomyelin, etc .), betaine, and L-carnitine and its metabolite -butyrobetaine (GBB), releasing TMA after the cleavage of the carbon (C)nitrogen (N) bond of choline/carnitine (Zhu et al., 2014)