You are purchasing both: (ALCAR) Acetyl L- Carnitine AND L-Carnitine Tartrate. These powders are both cousins to each other. L-Carnitine Tartrate is the purest form of L-Carnitine there is. It works better in your cells and gives your body energy. Acetyl-L-Carnitine has a significantly more noticeable effect on the mind than L-Carnitine and provides more brain power. One powder supports mental sharpness and one powder supports physical energy. Both of these powders will work together for your maximum benefit!