You can take B complex and Vitamin C daily as they are water soluble and excess of the vitamins will be flushed out through urine. Vitamins A,D,E are fat soluble and excess of these vitamins are not removed by the body. They are stored in the fat depots which can lead to toxicity if taken in higher doses unless required and prescribed by a physician after evaluating your blood levels. Hence, it is advisable to take Vitamin A, D, E only through a doctor s prescription which can be done only after a series of blood tests to determine if you have any vitamin deficiency.