The present invention relates to a novel wild-type Lactococcus lactis subsp. cremoris bacteria strain with increased vitamin K2 production and mutants and variants thereof and methods for preparation of a fermented food or feed product enriched in vitamin K2 and a vitamin K enriched edible product for amelioration and/or prevention of vitamin K deficiency. The present invention also relates to the fermented food or feed product and the edible product obtainable by the methods herein and to the wild-type Lactococcus lactis subsp. cremoris bacteria strain for use in treatment and/or prevention of vitamin K deficiency in a mammal, such as a human.
