After checking with oncologist I continue to take Omega3 fish oil, Garlic tabs., Glucosamine and Ginkgo Biloba although on Tamoxifen. Although we have been afflicted with breast cancer we still have to think of the health of our body as a whole - always check though with a medic.
Can I ask who told you you should not take vitamins? I am a 6 year survivor and never heard that. In fact, I do take vitamins, c being one of them. I was told to be careful taking herbs, etc. but not the vitamins. I think you need to talk to your oncologist regarding this.