Can one a day energy vitamins cause stomach pain, bloating & nausea? and if so, can it last for longer than a day after taking the vitamin?

Side effects: Without knowing the composition of the vitamin, it is hard to give an exact answer. However , it is certainly possible that something in the pill you are taking can cause these symptoms. I would recommend that you stop taking them to see if the symptoms stop. If so, it is probably the vitamin. If the symptoms stop, you can test it by taking a pill for a day or two to see if they recur.