How long do I have to take Vivomixx® to feel better? You will feel better already after 3-4 days but the optimal colonization is achieved in 2-3 weeks. csp2017-03-28T17:15:28+02:00 About the Author: csp Leave A Comment Cancel replyComment Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.