If I forget to take my vitamins, should I just double up and take them when I remember? Or, should I forego that dosage?
Jamieson's recommendation would be not to exceed the recommended daily dose advised on the product label.
For example, if you are supposed to take one multivitamin daily and you miss your dose, it isn't best to take two the next day. If, however, you typically take two tablets per day in divided doses (e.g. vitamin C 500 mg taken twice daily) and you miss taking your morning tablet, you could take two in the evening.
Please remember that you should not double up if it would cause you to exceed the recommended daily dose.