 The effect of anti-inflammatory substances on the constriction of the fetal ductus arteriosus is well documented, but the anti-inflammatory property of polyphenols and their effect on the metabolism of prostaglandins are not established. Evidence indicates that foods rich in polyphenols consumed from the third trimester of pregnancy may interfere with anatomical and functional activity of the fetal heart, presumably by the action similar to anti-inflammatory drugs nonsteroidal, causing inhibitory effect on prostaglandin synthesis. Objective: The objective of this study was to evaluate the effect of polyphenol supplementation on plasma levels of prostaglandin E2 in women of childbearing age use of hormonal contraceptives. As secondary endpoints were also evaluated other markers of inflammation and oxidative stress. The selected women were randomized to receive capsules polyphenol at a concentration of 3000 mg day or placebo capsules to be consumed daily for fifteen days. Was applied dietary recall to assess intake of polyphenols, measured height and weight and carried blood samples for prostaglandin analysis E2 PGE2, high sensitive C-reactive protein, and urine for analysis of total polyphenols and F2 isoprostane 8 iso-PGF2a. Statistical analysis: The results will be expressed through absolute and relative frequencies and mean standard deviation SD or median and interquartile range. For analysis, Pearson correlation is used. To compare the means will be used Students t test. The level of significance is 5. Considering a 90 power, with absolute error margin of 5 in the present study, 13 patients were needed in each group. 