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 Dont waste money on supplements like L carnitine. First focus on your diet and training. Also, oral L carnitine has low bioavailability. Injectable forms may absorb better, but diet and training Assessing the In Vitro and In Vivo Performance of L Carnitine Loaded Nanoparticles in Combating Obesity Amazon.com: Nature's Lab CoQ10 200mg with Alpha Lipoic Acid & L Carnitine High Absorption Heart & Brain Support Energy & Mitochondrial Function 60 Capsules Gold : Health & Household