L carnitine supplements bioavailability is very less and according to some studies it takes 8 to 12 weeks for for loss results, so if you decide to supplement with oral L carnitine do take it in Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications Stability enhancement and formulation development of l Carnitine fast dissolving pellets through pro drug strategy ScienceDirect Levocarnitine Liv Hospital