I suppose that it's possible that this drink really is made from placentas. But I prefer to believe that the name is figurative, rather than literal. If you discover otherwise, please keep that information to yourself.
Alternatively, this is just a beauty treatment, not a food option, and the note "no calorie" isn't meant to suggest that you won't gain weight by drinking it.
http://www.nihon-sofuken.co.jp/english/index.php via WTF Japan, Seriously!?