Welcome to the depression forum. I think your question is a good one. I don't know what the research is on combining antidepressants and vitamins, but perhaps another member will have some input on that. I am a huge fan of vitamin supplements, when taken under a doctor's supervision, and I think they can improve your health substantially. However, that is my personal opinion based on my own experiences, and I am not a medical professional. I hope you find the info you're looking for.
Moderator, Depression Forum
“Hope is the pillar that holds up the world.” ~Pliny the Elder