The placenta contains high levels of prostaglandin which stimulates involution (an inward curvature or penetration, or, a shrinking or return to a former size) of the uterus, in effect cleaning the uterus out. The placenta also contains small amounts of oxytocin which eases birth stress and causes the smooth muscles around the mammary cells to contract and eject milk.
The most general benefit of placentophagy, according to recent research, is that placenta and amniotic fluid contain a molecule (POEF, Placental Opioid-Enhancing Factor) that modifies the activity of endogenous opioids in such a way that produces an enhancement of the natural reduction in pain that occurs shortly before and during delivery
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