![1girl artist_request bottle cosplay dress frills izumi_konata long_hair lowres lucky_star mole mole_under_eye orange_eyes rozen_maiden silver_hair solo suigintou suigintou_(cosplay) yakult rating:s score:2 post #293983](/cdn_image/preview/44/f9/44f9548f1e8b5bb9fb378a79448bffb6.jpg)
A brand of cultured milk which contains a strain of lactobacillus bacteria (Lactobacillus casei Shirota) to promote good digestion in the body.
Often associated with Suigintou due to a scene in the Rozen Maiden anime where she taunts an old man and asks him if he's had his lactobacillus drink today.