Below are a few quotes I thought were quite interesting. It was a very balanced interview and I encourage you to have a listen - the whole interview is just over 11 minutes and was recorded last year.
Compared to either blood, so the mother's blood or the baby's blood that is accessed from the umbilical cord after delivery, and also breast milk, the placenta is actually much much higher in a lot of minerals like calcium, like iron, zinc and other minerals than those sources.
Any toxins that might be present in the placenta have come from the mother's own blood. So that means whatever toxins she's exposed to could be accumulating in the placenta so she's already been exposed to that, so you might say that having placenta pills is giving more back to the woman. But really, they came from her so it's not like there's any other exogenous source. I wouldn't be too concerned about that [toxins] if you're eating your own unless you're a woman who perhaps lives next to a lead smelter or something like that.