In 3 small studies of CoQ10 in breast cancer patients, some patients appeared to be helped by the treatment. Weaknesses in study design and reporting, however, made it unclear if benefits were caused by CoQ10 or by something else (see Question 6).
CoQ10 may not mix safely with other treatments. It is important that patients tell their health care providers about all therapies they are currently using or thinking of using (see Question 7).
CoQ10 has not been carefully tested in combination with chemotherapy to see if it is safe and effective. Because CoQ10 is sold as a dietary supplement rather than a drug, it is not regulated by the US Food and Drug Administration (see Question 8).
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WebMD Public Information from the National Cancer Institute
May 28, 2015
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