A process for preparing a beverage or beverage component comprising the steps of; providing brewer's spent grain performing a saccharification by enzymatic treatment of the brewer's spent grain and a fermentation of the sacchahrified brewer's spent grain with lactic acid bacteria and/or acetic acid bacteria and/or probiotics to obtain a fermented broth; and filtering the fermented broth and collecting the permeate to obtain the beverage or beverage component; or homogenizing the fermented broth to obtain the beverage or beverage component.

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