Jeju oranges. Mmmmmm... Little. Easy to peel...very easy....can get rid of 95% of the white stuff. No seeds. Sweet. Oh so juicy. Some call them mandarins. Some call the oranges. Some call them something else I can't think of now. To me, they are simply delicious. The dogs love them, too.
Considering that orange peel is an ingredient in some recipes, I'd have to say that it wouldn't hurt you. Seeds? I don't know. I remember being shocked when I found out that apple seeds contain trace amounts of cyanide in them. Can't remember hearing anything about orange seeds though.