The recommendation is to take vitamins and minerals daily after bariatric surgery. If you have been out of this routine for a long time, go to your surgical center or general practitioner to get your labs taken so that you can check for any deficiencies or trends toward deficiency that may be occurring.
It’s also important to start taking your supplements as soon as possible. Some deficiencies take a long time to develop, so even if your labs are in a good range despite not taking your supplements, it is important to get into a consistent vitamin/mineral routine.