Banner's Cultured Butter Whey is genuine buttermilk, produced by churning their grass-fed, slow-cultured cream into butter (not by souring milk).

"Our buttermilk, or cultured butter whey, is the real deal. Many years ago, when industrial-scale companies took over butter-making, they didn't have time to culture the cream before churning it into butter. So, they simply soured milk and called it buttermilk. But ours is the buttermilk you get when you churn real, true cultured butter. It's butter's milk!"