Please be careful taking supplements during chemotherapy either without your oncologist's knowledge or against their wishes. As Joannie said some supplements can react with the chemo drugs - causing worse side effects and/or reducing the effectiveness of the treatment.
Oncologists don't stop you from taking supplements just to be nasty - they do it based on evidence of what effects the supplements will have on your treatment. Please at least discuss your supplements with your doctors.
If they say that the supplement won't help but won't harm - then go ahead if you wish. But if they say that the supplement will effect your treatment please listen to them.
