Omega-3 Fatty Acid in Reducing Cancer-Related Fatigue in Breast Cancer Survivors

Inclusion Criteria: * Have a confirmed diagnosis of breast cancer; participants can have had more than one primary cancer diagnosis in the past * Have undergone some type or combination of standard adjuvant treatment (surgery, chemotherapy, radiation therapy) for breast cancer * Have completed all forms of standard adjuvant treatment (surgery, chemotherapy, radiation therapy) for breast cancer between 4 and 36 months prior to enrollment in the study; participants can be currently taking hormones (such as tamoxifen) or monoclonal antibodies (such as Herceptin) * Must have cancer-related fatigue, as indicated by a response of 4 or greater when asked to rate their level of fatigue at its worst in the past week on an 11-point scale anchored by "0" = no fatigue and "10" = as bad as you can imagine * Be able to read English * Able to swallow medication * Give written informed consent Exclusion Criteria: * Have used marine omega-3 supplements at any time within previous 3 months (this includes prescription omega-3 drugs such as Lovaza®) * Be taking anticoagulant medication (does not include aspirin) * Have sensitivity or allergy to fish and/or shellfish * Have sensitivity or allergy to soy and/or soybeans * Have confirmed diagnosis of chronic fatigue syndrome or other diagnosis known to cause severe fatigue