they are called "one a day" because that is all you really should take. the body does not really store most vitamins so if you take two by accident (harmless) you will just pee out most of those excess vitamins so taking two would be a waste of money. certain vitamins like a or d can accumulate to toxic levels so one must be careful not to exceed the recommended dosage unless specifically prescribed by a medical provider. as a rule just take one a day. not two.
can you take 2 one a day vitamins. i took 2 one a day vitamins by accident i took one in the morning and one in the evening i felt good and i worked out and had energy. can i always do this is it ok?