Vitamin Gum Pharmacokinetics

Study Design The study will involve two phases. The first phase will be to compare the release of the component vitamins in two chewing gum products into the saliva. This will employ a parallel design in which half the subjects (7 - 8) chew a product marketed for athletes "Sport" and half (7 - 8) chew one marketed for immune system support "Immunity". The second phase will be to compare the acute effects of chewing the two gums on plasma levels of the component vitamins. A single-blinded, double cross-over design with 15 healthy human subjects will be employed. Subjects be randomly assigned to "Sport", "Immunity", or a placebo gum matched for color and flavor but without vitamins. Each phase will be separated by a one-week washout period.

Study Procedures 1. Screening: There will be a phone screening prior to medical screening at the University Park Clinical Research Center (CRC). This will be used to establish explain the study to the prospective participant, establish eligibility and set up an appointment for the medical screen.

2 Medical Screen: Prior to acceptance into the research study, participants must complete consent forms, a medical history form, and have measurements taken (height, weight, blood pressure). If female, a urine pregnancy test will be self-administered to ensure that the subject is not pregnant. If the subject is still eligible after these tests, a small amount of blood (10 mL) will be collected by a CRC nurse using a single needle stick. The blood will be screened for markers of liver function (alanine aminotransferase, aspartate aminotransferase, or bilirubin), kidney function (blood urea nitrogen), and iron status. If a blood sample cannot be collected, the nurse try a second time, or to withdraw from the study. If a second try is unsuccessful, the participant will be excluded from the study.

3 Research Study Overview: If eligible, the subjects will have four study days (1 visit to the Food Science Building and 3 visits to the CRC). The visit to the Food Science Building will be for collection of saliva samples and will last less than 1 h. The three visits to the CRC will be to collect blood samples and will be scheduled from 7:30 am to 6:00 pm. During this day, the subject will be required to remain at the GCRC from 7:30 am to 12:30 pm. The subject will be able to leave after 6:00 pm, but will need to return at 7:30 pm for an additional blood draw.

4 Prior to Study Visits: Subjects will be required to refrain from the use of any vitamin supplement for one week prior to initiation of the study and for the duration of the study. They may consume their normal diet during the study. On the days of the "Blood Collection" visits, the subjects arrive at the CRC having not eaten breakfast. Breakfast will be provided by the investigators prior to the insertion of the catheter. The subjects should drink plenty of water on the day before and the day of the study visit.

5 Saliva Collection Visit:

1. Subjects will report to the Food Science Building at a mutually-agreed upon time.
2. Subject will be instructed to brush their teeth with a new toothbrush and toothpaste (provided by investigator) prior to the start of the session.
3. Subjects will be instructed to consume 250 mL of tap water prior to starting the chewing gum treatment.
4. Prior to chewing, an unstimulated baseline saliva sample will be collected. e. Subjects will be randomly assigned to a treatment group and given the test gum (2 pieces of gum) and instructed to chew the gum for 30 min. To standardize chewing rate, subjects will be asked to chew in time to a metronome (set to 72 beats per minute) f. Subjects will then expectorate into a centrifuge tube at 2, 5, 15, and 30 min after chewing is commenced.
5. All saliva produced during the 30 min experiment will be collected, as well the gum.

6 Blood Collection Visits:

1. The subjects will be asked to report to the CRC by 7:30 am. On each study day, the subjects will be provided with low vitamin breakfast and lunch by the investigator. The subjects will be asked to complete the meal by 8:00 am.
2. The subjects will have the option of having a numbing lotion (LMX cream containing lidocaine) applied to their arm. This anesthetic takes 30 minutes to take effect. If the subjects wish to use the lotion, they must tell the CRC study staff before the visit since it affects the experimental timing.
3. A nurse will insert an IV catheter into a vein on their arm or hand. This will allow the nurse to draw multiple blood samples without having to insert a needle each time. If the first attempt to insert the catether is unsuccessful, the nurse will make a second attempt. If a catether cannot be established, the participant will be excluded from the rest of the study. The catheter will be removed at 4:00 pm on the first day of each set of study visits. Because of the design of the research study, one additional blood sample will be collected using a separate needle insertion at 8:00 pm of the visit. This means that the subject will receive 2 needle insertions per visit.
4. Once the IV catheter is inserted, 10 mL of blood will be collected (~2 teaspoons).
5. The subject will then be asked to chew one ("immunity") or two ("sport") pieces of test gum (or 2 pieces of placebo) in time with a metronome (72 beats per min) for 30 min.
6. At 15 minutes, 30 minutes and 1.5, 4.25, and 10 hours, the nurse will collect additional 10 mL blood samples.
7. The subject will chew one ('immunity") or 2 ("sport") additional pieces of test gum (or 2 pieces of placebo) at 45 min, 4, and 8 hours after the insertion of the catheter (time 0).
8. Around noon, the subject will be given a low vitamin lunch by the CRC.
9. Because the time between blood samples increases over the course of the day, the subject will be allowed to leave the CRC following collection of the 4.25 hour 10 mL blood sample (12:30 pm). The nurse will remove the catheter at 12:30 pm. The subject will need to come back to the CRC at 6:00 pm for a 10 hour 10 mL blood collection.
10. The second and third blood draw visits will be identical to the first visit, except the subjects will be assigned to the other treatment groups.