I had chronic fatique. doc put me on injectable vitamin B12, although he's using something different now, methyl b12. It really makes a huge difference, not just in my energy, but my state of well being. It helps you digest food properly, which was the root of my problem. I can't help but think that the energy drink could be pushing your system, not healing it. I took EmergenC for a while, and the Sugar content started giving me an undeniable anaphylaxis symptoms.