Horse and cow placentas. The urban legend of human placentas has been debunked. HOWEVER, a european company did try it with human placentas at a very high price, so they switched to cow and lievstock placentas since they were ‘more readily available’ in bulk quantities.
Sorry, but you are wrong. Human placentas have been used and are still being used to this day. Pharm companies harvest the blood and stem cells from them, and then use the collagen matrix to extract hyaluronan for surgical and high end collagen replacement products. Do you really think that hospitals just throw the placenta away?