Susan,
Shortly after I finished treatment, I was big on drinking LOTS of green tea. These years later, however, that has pretty much fallen by the wayside.
If you are being treated at MCMC, I feel confident that anything they give you is quite safe to take. You might also research this at the Planetree Health Resource Center at 200 East Fourth. Michele, Linda, and Marilyn are great at finding or helping you find any information you desire. This library is free to the public, a service of MCMC.
I hope your recovery is coming along nicely.