how much l-carnitine NOW Foods: Fitness Support 1000mg, 100 tabs : Health & Household Cutler Nutrition Liquid L-Carnitine Fat

Additional Services Vitamin B Complex and Vitamin C Vit C / Glutathione / Zinc Amino acids (Glut/Arg/Lys/Glycine) Carnitine / Amino acids (Glut/Arg/Carn.) CoQ 10 MIC / B-Complex / Carnitine MIC / B-12 Vitamin D NAD+ Glutathione The Benefits of the MIC, B-Complex, B12, and Carnitine Blend This injection combines the best of lipotropic agents, essential vitamins, and amino acids to provide comprehensive support for your bodys natural processes

Acetylcarnitine By Ed (Edgar181) Own work (Public Domain) via Commons Wikimedia

That all indicates to me that if you reach a B12 intake level that gives you coloured wee...you just scale back a bit

Morton GJ, Cummings DE, Baskin DG, Barsh GS, Schwartz MW (2006) Central nervous system control of food intake and body weight