BCCT plans to write a summary on selenium. While our summary is in development, you can visit these sites:

Before using this therapy, consult your oncology team about interactions with other treatments and therapies. Also make sure this therapy is safe for use with any other medical conditions you may have.

Clinical Practice Guidelines

The Society for Integrative Oncology’s 2009 clinical practice guidelines found insufficient evidence to recommend selenium for improving side effects of chemotherapy, radiotherapy or surgery, quality of life or lymphedema.1


The Moss Reports list the availability, names  and costs of some selenium supplements. Moss Reports (purchase required).


Both About Herbs and CAM-Cancer list adverse reactions, herb-drug interactions and contraindications for selenium.  Read the summaries for more information. About Herbs: Selenium and CAM-Cancer: Selenium—during cancer treatment.

Selenium toxicity, more so from supplements than from dietary sources,  can be serious, so careful attention is needed about doses and the length of time you take selenium. Doses are in micrograms (μg), not milligrams (mg). A microgram is 1/1000 of a milligram. 

Supplementation is associated with an Increased risk of cancer for those with higher serum levels before supplementation.2  According to CAM-Cancer, selenium supplementation may increase the risk of nonmelanoma skin cancer recurrence, especially in fair-skinned people.


BCCT does not recommend therapies or doses, but only provides information for patients and providers to consider as part of a complete treatment plan. Patients should discuss therapies with their physicians, as contraindications, interactions and side effects must be evaluated.

Dosage recommendations are available from these sources:

Integrative Programs, Protocols and Medical Systems

For more information about programs and protocols, see our Integrative Programs and Protocols page.

View All References

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