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At least three companies currently [when?] sell hair or skin treatments which contain extracts of animal placenta. [1] The most common type of placenta used is sheep. The placental extract allegedly serves as a source of protein and hormones, predominantly estrogen and progesterone, in the cosmetics in which it is used.
In the sheep and human, progesterone is the major placental progestogen. The equine placenta produces a variety of progestogens, primarily 5α-dihydroprogesterone and 5α,20α-tetrahydroprogesterone, beginning on day 60. A complete luteo-placental shift occurs by day 120–150.
The form of the human placenta is generally classified as a discoid placenta. Within this, the cotyledons are the approximately 15-25 separations of the decidua basalis of the placenta, separated by placental septa. [3] Each cotyledon consists of a main stem of a chorionic villus as well as its branches and sub-branches. [3]
Dried human placenta as medicine (ziheche) (紫河车) Although the placenta is revered in many cultures, there is scarce evidence that any customarily eat the placenta after the newborn's birth. [10] Those who advocate placentophagy in humans believe that eating the placenta prevents postpartum depression and other pregnancy complications.
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The placenta has high protein, rich iron and nutrient content, but there is inconclusive scientific evidence about any health benefit to its consumption. [5] The risks of human placentophagy are also still unclear, [ 6 ] but there has been one confirmed case of an infant needing hospitalization due to a group B strep blood infection tied to ...
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The class Mammalia is divided into two subclasses based on reproductive techniques: monotremes, which lay eggs, and therians, mammals which give live birth, which has two infraclasses: marsupials/metatherians and placentals/eutherians.