One positive thing that typically stops when you discontinue the medication: the side effects, mainly gastrointestinal discomfort like nausea, says Matthew Hayes, a psychiatry professor at the Perelman School of Medicine at the University of Pennsylvania who studies neural signaling pathways in obesity
Stevens JE, Buttfield M, Wu T, Hatzinikolas S, Pham H, Lange K, et al
10.1021/acs.est.0c03057 23 Di PoiC.CostilK.BouchartV.Halm-LemeilleM
If you are working with a qualified clinical team who is assessing your total nutrition (food and supplements), medications, lifestyle choices and will do so while you are on the medication, you may not need other services, so just getting the medication could be a win.
Suspected side effects from any medicine should be reported to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk
Further, even though preparation of L-carnitine from D-(R)-tartaric acid is also known (Tetrahedron Letters, (1990) 31:7323-7326), this method also presents problems such as long and complex production processes