source of l carnitine Naturals L-Carnitine Capsules 250mg, 120 ct Carnitine - Wikipedia
Description
It was demonstrated in animal studies that unabsorbed quaternary amines such as choline, phosphatidylcholine, betaine or l-carnitine can be metabolized by gut microorganisms to produce the intermediate compound trimethylamine (TMA)
Proc Natl Acad Sci USA 110:48044809 Madiraju P, Pande SV, Prentki M, Madiraju SR (2009) Mitochondrial acetylcarnitine provides acetyl groups for nuclear histone acetylation

235 In a controlled trial involving 130 fibromyalgia patients being treated with duloxetine plus pregabalin, the addition of 500 mg of acetyl-L-carnitine plus 600 mg of palmitoylethanolamide (PEA) twice daily for 12 weeks improved Widespread Pain Index, Fibromyalgia Impact Questionnaire, and Fibromyalgia Assessment Status scores more than medical treatment alone

It is a popular choice among active individuals who want to optimise their performance or wellness routine.
