What is one for all one for all is a handy little one a day multivitamin tablet providing 7 essential vitamins needed for health and wellbeing why use one for all this premium quality effective multivitamin is a great way of boosting the daily diet with all the vitamins associated with general health and wellbeing each tablet provides your recommended daily allowance rda of 7 key vitamins including a c d3 and e vitamin a and c contributes to the normal function of the immune system