>> It doesn't make sense to me. It concerns me that the placenta would contain progesterone, which could inhibit milk supply.<<

Keep in mind the "route of administration." Generally speaking, progesterone taken orally is rapidly metabolized and not as bioavailable as that taken vaginally or by injection. If inhibition were a risk, I would wonder why all those mammals eat their placenta. 

Lisa Marasco, MA, IBCLC, FILCA

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