Antioxidant Effects of Bioactive Components of Kefir

Kefir is a fermented milk product with a high nutritional value and a unique taste and aroma that supports health, whose popularity has spread around the world today. Our aim in this study was to investigate which active ingredients in kefir have antioxidative effects in terms of directly or indirectly reducing the effects of free radicals by conducting a detailed biochemical investigation of the existing information about the antioxidant effects of kefir. By using the PubMed database, the keywords "kefir, probiotic, oxidative stress, antioxidant" were used to access the relevant articles without time restrictions. In the study, it can be said that the antioxidant effect of kefir is to neutralize the reactive oxygen species in the plasma and to reduce the stress responses by increasing the antioxidant enzyme levels.