does l carnitine upset the stomach Nutricost Acetyl L-Carnitine (ALCAR) 500mg,

doi: 10.1007/s00706-005-0335-6

Ma LL, Wang YY, Yang ZH, Huang D, Weng H, Zeng XT (2020) Methodological quality (risk of bias) assessment tools for primary and secondary medical studies: what are they and which is better

L-carnitine is a natural compound that is formed in the body from the two amino acids L-lysine and L-methionine and is also found in various animal and some plant foods

Do not use this product if you are at risk or are being treated for any medical condition of if you are taking MAO inhibitor

Carnitine was first discovered to be a significant component of muscle

Notably, thyroid hormones may facilitate augmented carnitine synthesis in the liver by increasing -butyrobetaine hydroxylase (BBD) activity and gene expression, which may constitute a feedback regulatory loop between thyroid hormones and carnitine [80]