Sometimes zymaxid is used to treat bacterial conjunctivitis or pink eye. A generic version of zymaxid may be available in the future, Allergan, the makers of zymaxid, will lose their patent in 2016 and then the active ingredient called gatifloxacin would be the generic equivalent eye drops. Read more about generic zymaxid drops.
The longer answer is that vitamins, especially the B vitamins (thiamine, riboflavin, niacin, pantothenic acid, Vitamin B6, biotin, and folic acid) do contribute to energy metabolism, by helping your body turn carbohydrates, proteins, and fats into utilizable energy.
B-complex vitamins all work together to support cellular metabolism. B vitamins help the body metabolize carbohydrates, proteins and fats into glucose, which the body uses for energy. Glucose is the main source of energy for the brain and the body. Lack of B vitamins leads to weakness and fatigue.