They are not the most expensive
Acetylcarnitine supplementation reduced both mental and physical fatigue, and improved health-related quality of life in people undergoing treatment for hepatitis C (the treatment for hepatitis C treatment produces symptoms that are similar to ME/CFS.) A large cancer study did not find, however, that 2g of L-carnitine a day improved fatigue in cancer patients and a meta-review did not support the use of carnitine for fatigue in cancer
Some need glucuronic acid (large, bulky tag), some need glutathione (for reactive electrophiles), some need a sulfate group (small, efficient for hormones and neurotransmitters), some need an acetyl group (for amines), some need a methyl group (for catecholamines and histamine), and some need an amino acid like glycine (for organic acids)
Cognitive impairment and type 2 diabetes mellitus: Focus of SGLT2 inhibitors treatment
Most patients describe a GLP-1 shot as a fleeting pinch followed by a faint warmth or small bump that fades within minutes