According to current research, while resveratrol is a molecule that has weak estrogen-like qualities, unlike other plant estrogens such as from soy, it does not increase the activity of estrogen. Resveratrol has been shown to increase sperm volume in animals by stimulating the hypothalamus and pituitary glands and protects sperm from oxidation. Resveratrol may hinder sperm mobility, but does not reduce the number of offspring in animal studies. Resveratrol is about 1/7000th the activity of estrogen (soy phytoestrogens are about 1/1000th the strength of estrogen) and resveratrol has a half-life of 30 minutes, so it doesn’t exert activity continually.