It's best used immediately after the birth, and as long as the bleeding continues. The Blue Cohosh is an oxytocic herb, helping the uterus to contract and clamp down. Yarrow is a powerful styptic. Motherwort is well-known for being a reliable hemorrhage preventer and uterine tonic, and the Alfalfa is very high in Vitamin K, helping to coagulate blood. Use only at birth.