Do you recommend any horror / gore anime?

HIGURASHI:WHEN THEY CRY

I saw you only had one reply (which is so sad) but the only gory ones ik off the top of my head are elfen lied and hellsing. (warning elfen lied is kinda sad)

You should definitely watch High-Rise Invasion; if you haven't already!

Happy sugar life or Elfen lied

Since no one mentioned these:

Corpse Party definitely

Dororo has it in the beginning, great story

Dorohedoro is amazing

Hell's Paradise has some in it, really cool setting and action there!

I haven't checked em out but Berserk and Genocyber do I think.

i really loved gyo from junji ito.

GORE:
I AM A HERO: zombie manga, with a twist and lots of psychological developments
Dorohedoro: as said from someone else
Franken fran: its about a empty headed scientist that will save a humen life at ANY cost. lots of body horror and gore, but it is more of a slice of life -ish
Brutal: Satsujin Kansatsukan no Kokuhaku: its about a homicide detective that kills criminals in grusome ways. if you know the show dexter its exactly that