OptiBac For Your Baby Dropper 10ml. A high quality friendly bacteria liquid drop supplement containing Bifidobacterium breve M-16V®. Scientifically researched in thousands of newborns & babies.. Ingredients:. Medium chain triglyceride oil (plant source). Live cultures: Bifidobacterium breve M-16V®. Emulsifier: mono and diglycerides of fatty acids (plant source).