Is your supermarket kefir really kefir? Spanish study raises a surprising question

According to a report by Euro Weekly News… Kefir has gone from something most people had barely heard of to a regular fixture in Spanish supermarket fridges. It […] complete report is on link below. Source: https://euroweeklynews.com/2026/09/25/is-your-supermarket-kefir-really-kefir-spanish-study-raises-a-surprising-question/