I would like to take a multivitamin. Can I also take extra vitamin d and B12 1000mcg with the multivitamin? I dont have much energy is the reason for the extra supplements.

Supplements. B12 even if you get more it is not a problem will be washed out, Vit D can cause toxicity it taken too much. Both these vitamins levels could be easily checked with simple blood tests to relieve the doubts.