Can multi vitamins provide mental alertness?

Not quite: Intellectually, question is intriguing, as this gets into medical foods, a prescription product. Vitamins must be chemically altered in the body to become biologically active. As we age, we may lose this ability, and become demented, with an elevation of homocysteine. Active folate, (folic acid) and b-12 can restore the balance and improve cognition in these patients, but does not really enhance alertness.