5 doctors weighed in:
What vitamins are okay with femara (letrozole)?
5 doctors weighed in

Dr. William Banks Hinshaw
Obstetrics & Gynecology
2 doctors agree
In brief: Vitamins are OK
Femara is an enzyme-inhibitor which eliminates the conversion of testosterone to estrogen.
As such, it is a valuable drug, but this elimination potentially increases the risk of bone loss. Thus taking supplemental vitamin d and getting a test to make sure your level is normal is a good idea and will not interfere with the effect of the medicine.

In brief: Vitamins are OK
Femara is an enzyme-inhibitor which eliminates the conversion of testosterone to estrogen.
As such, it is a valuable drug, but this elimination potentially increases the risk of bone loss. Thus taking supplemental vitamin d and getting a test to make sure your level is normal is a good idea and will not interfere with the effect of the medicine.
Dr. William Banks Hinshaw
Dr. William Banks Hinshaw
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Dr. Cynthia Anderson
Radiation Oncology
1 doctor agrees
In brief: Not antioxidants
There are data that high doses of vitamin e supplements can interfere with cancer therapy.
Vit e is an anti-oxidant. Getting it in the diet is ok, but taking it as a supplement can be harmful. Vitamin d and calcium are ok to take as high vitamin d levels are associated with decreased breast cancer recurrence.

In brief: Not antioxidants
There are data that high doses of vitamin e supplements can interfere with cancer therapy.
Vit e is an anti-oxidant. Getting it in the diet is ok, but taking it as a supplement can be harmful. Vitamin d and calcium are ok to take as high vitamin d levels are associated with decreased breast cancer recurrence.
Dr. Cynthia Anderson
Dr. Cynthia Anderson
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