Topical Area: Vitamins and Minerals
Objectives : To determine the bioavailability of folic acid and iron from a multivitamin tablet formulation following a single dose and 28 days of supplementation.
Methods : The tablet formulation included iron (ferrous fumarate, 18 mg) and folic acid (400 mcg) plus 21 additional nutrients; Cmax and Tmax were determined. For the single dose study, subjects (n=35, 45-76 y, 49% Female/51% Male) ate standardized food the previous day, then fasted (10 h) prior to the intervention. The study tablet was consumed without food 15 min following baseline blood collection. Blood was drawn at 1, 2, 4, 8, and 10 h post-ingestion of the study tablet. For the 28-day supplementation study, subjects (n=16, 18-65 y, 81% Female/19% Male) consumed 1 tablet/day; fasting blood iron and folic acid levels were determined every 7 days. Subjects ate standardized meals the day prior to blood draws. In both studies, differences compared to baseline were determined using paired t-tests for normally distributed data. In the 28-day supplementation study, differences compared to baseline for non-normally distributed data were determined using a Wilcoxon Signed Ranks test.
Results : In the single dose study, iron concentration significantly increased (p< 0.05) compared to baseline at 1, 2, and 4 h with a Cmax of 130.24 ±8.079 mcg/dL and Tmax at 160.0 ±0.284 min. Folic acid concentration significantly increased (p< 0.05) compared to baseline at 1, 2, and 4 h with a Cmax of 23.32 ±0.295 ng/mL and Tmax at 60.0 ±0.254 min. In the 28-day study, blood iron concentrations significantly increased (p< 0.05) compared to baseline at days 21 and 28. Additionally, folic acid concentrations significantly increased (p< 0.05) compared to baseline at days 14, 21, and 28.
Conclusions : A multivitamin tablet increased blood iron and folic acid levels when delivered as a single dose or daily for 28 consecutive days. These results demonstrate that folic acid and iron are readily absorbed and bioavailable from this multivitamin tablet formulation.
Funding Sources : This study was funded by Pharmavite LLC.