Vitamin K2 supplements may cause allergic reactions in some people, although no side effects associated with taking this vitamin orally have been identified to date.
In general, vitamin K supplementation is usually not recommended for babies or people with kidney problems, a history of vitamin K allergy, or those taking anticoagulants, for example, and should only be used under a doctor's guidance.
In addition, vitamin K2 is produced by bacteria that are part of the intestinal microbiota and can also be found in animal-based foods, such as egg yolks and certain types of cheese. Therefore, taking supplements containing vitamin K2 is generally not necessary. Read more about about foods rich in vitamin K that you can incorporate into your diet.