Should I take anti-oxidants prior to, during, and post treatment?

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I thought I was doing my body a favor by upping my vitamin intake, by both my oncologist and an alternative/complementary MD tell me I should cease all anti-oxidants during treatment. This is because they may support the health of the cancer cells as well as the normal cells.

Sounds like I need to stop my Vit A, Vit C, Vit E and CoQ10 supplements as well as Curcurumin/Turmeric immediately.

Can anyone point me in the direction of an authoritative source on this?

I've just started Herceptin and post-re-excision, will do six cycles of taxotere and carboplatin.

Thanks!