Avmacol is an over-the-counter dietary supplement containing broccoli seed and sprout extracts in tablet form, hypothesized to activate protective cellular pathways including detoxication. In this study, healthy volunteers will take 3 days of Avmacol in order to evaluate both bioavailability and its bioactivity in cheek cells.

Avmacol is an over-the counter dietary supplement containing broccoli seed and sprout extracts in tablet form. Natural plant substances within Avmacol, called phytochemicals, are hypothesized to stimulate the body's own defense mechanisms against toxic substances commonly encountered in the environment, such as air pollution and tobacco smoke. The purpose of this study is twofold: 1) to assess the protective effects of Avmacol on the mucosa (cheek cells) of healthy volunteers, and 2) to assess the collection of cheek cells by scraping, as a less invasive method of studying drug effects in the body compared to drawing blood or a tissue biopsy. Ultimately, these results will be used to design a larger study of Avmacol in patients with tobacco-related head and neck cancer. Avmacol will be studied as a way to possibly prevent a second cancer from developing in these patients.

Inclusion Criteria:

1. Age ≥ 18 years.
2. Members of all racial and ethnic groups are eligible.
3. Smoking and non-smoking people are eligible. The tobacco use assessment form must be completed following consent and registration.
4. No chronic use of steroids
5. Karnofsky Performance Scale ≥90%
6. Able to provide written, informed consent
7. For women of child-bearing potential (WOCBP), a negative urine pregnancy test must be documented within 7 days prior to the first study intervention
8. Willing to avoid cruciferous vegetables during the study interventions
9. Willing to avoid grapefruit or grapefruit juice 48 hours prior to or during the study
10. Willing to avoid daily vitamins and anti-inflammatory medications prior to and during the study
11. Women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study and for the duration of study participation.
12. Willing and able to perform self-collection of buccal cells as stated in the instruction manual

Exclusion Criteria:

1. No current or former diagnosis of cancer, with the exception of: carcinoma-in-situ of breast or cervix; non-melanomatous skin cancer; T1-2, N0, M0 differentiated thyroid carcinoma; superficial bladder cancer; T1a or T1b prostate cancer comprising < 5% of resected tissue with normal prostate specific antigen (PSA) since resection
2. No use of chronic prescribed medications which are potent inducers or inhibitors of CYP3A4
3. Chronic use anticoagulation