Ravikumar S, Prabhu S, Vani R (2020) Effects of L-carnitine on the erythrocytes of stored human blood
In this version, an acetyl group is attached to the sulfur atom of the cysteine
See the Tirzepatide protocol page for the standalone reference
Defined: Glutathione Glutathione (GSH) is an important antioxidant in plants, animals, fungi, and some bacteria and archaea, preventing damage to important cellular components caused by reactive oxygen species such as free radicals, peroxides, lipid peroxides, and heavy metals.[2] It is a tripeptide with a gamma peptide linkage between the carboxyl group of the glutamate side-chain and the amine group of cysteine (which is attached by a normal peptide linkage to a glycine)
It turns out that this can cause relative carnitine deficiency, which can result in lingering fatigue (even after thyroid hormone therapy )
Avoid suppliers who make explicit medical claims or cant document purity and potency