I was told to get off all the supplements. Some of them can cause bleeding post-op.
For other surgeries I have taken my own meds and kept them myself, taking as needed. But for the fundo I just took what they gave me. I was fine without my vitamin for a few days!
Post-op I couldn't swallow pills, so I was given liquid meds. I did open the Nexium capsule (it's allowed anyway) and just swallowed the tiny granules with a drink.