Limonene Study in Women With Breast Cancer

Inclusion Criteria: * Women who are 18 years of age or older * Women electing to undergo excision surgery for early stage breast cancer * A minimum of 2 weeks from enrollment to definitive surgery * Underwent core needle biopsy for breast cancer diagnosis * No clinical evidence of metastatic breast cancer * ECOG performance status 0-1 * Participants must have normal organ and marrow function * Women of child-bearing potential must agree to use adequate contraception * Ability to understand and the willingness to sign a written informed consent document Exclusion Criteria: * Concurrent chemotherapy or radiation therapy * Use of selective estrogen receptor modifiers or aromatase inhibitors within the past 3 months or concurrently * History of other malignancies within the past 5 years excluding non-melanoma skin cancer and cancers confined to organs with removal as only treatment * Participated in another clinical intervention trial within the past 3 months * Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements * Pregnant or breast-feeding women * Use of dietary supplement that contains large amounts of d-limonene (such as Heartburn Free with ROH10 and CoQ with d-limonene) within the past 3 months