This new hard seltzer is made from the whey waste of Greek yogurt

From their FAQ page:
Pronounced: “supa-frow”. Superfrau means Superwoman in German. It’s a tribute to our Alpine roots and all of the super benefits derived from the milk of a female cow. We think drinking fresh whey is super and makes you feel super too!

Alpine pro tip: if it comes from a male cow it’s high in protein, but not milk as such.

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