l carnitine function fatty acid transport mitochondria Carnitine-mediated long-chain fatty-acid and mitochondrial Carnitine shuttle - Wikipedia
Description
Transcriptional regulation of rat hepatic low-density lipoprotein receptor and cholesterol 7 hydroxylase by thyroid hormone
Taking exogenous ketones will raise the level of ketones in your blood temporarily

pubmed.ncbi.nlm.nih.gov/16406920 ESHRE Add-ons Working Group

i assume for GH

Effects of L-carnitine supplement on plasma coagulation and anticoagulation factors in hemodialysis patients
Given the expense, its unclear if companies producing Armour Thyroid, NP Thyroid, or Nature-Throid will pursue this route