Board Thread:Naruto Discussions/@comment-26190972-20151021201438/@comment-4912646-20151022084616

Going by the databook, at least some, if not all, medical ninjutsu is Yang Release, since some medics (Tsunade, Rin) can only use Yang and not Yin. Problem is there's a medical ninjutsu with Yin right in the name. Then again, this also can't be Yin Release going by the databook's logic.