Onagi =fresh water eel
Unagi= saltwater eel

Disclaimer:
No eels were injured in the making of this reply.

http://www.fda.gov/fdac/reprints/puffery.html

Human placenta is the nourishing lining of the womb
(uterus), which is expelled after birth. When placental materials were first used as cosmetic ingredients in the 1940s, manufacturers promoted the products as providing beneficial hormonal effects such as stimulating tissue growth and removing wrinkles. (Although newborn infants emerge from the womb with wrinkled skin!) The hormone content and the tissue-growth and wrinkle-removing claims classified the placenta-containing products as drugs, and FDA declared them to be ineffective and therefore misbranded

Remember pearl harbor!