Can promote a healthy intestinal lining Avitale Darmflora AKTIV PLUS contains niacin, vitamin B2 and biotin, as well as 10 selected lactic acid and bifidobacteria cultures that also occur in the human intestine. Niacin, biotin, and vitamin B2 contribute to the maintenance of normal mucous membranes. Therefore, they also play a role in the intestinal mucosa. Folic acid supports the immune system and cell division. Biotin contributes to the metabolism of macronutrients.