Adding This One Ingredient To Your Coffee Grounds Can Banish Acidity Without Affecting Flavor - Tasting Table
Briefly

Eggshells can effectively reduce bitterness in coffee due to the alkaline calcium carbonate they contain. The acidity of coffee can vary based on roasting and preparation methods, with finer grinds being more acidic. By adding crushed eggshells to coffee grounds before brewing, you can achieve a smoother, less bitter flavor. Eggshells are safe to consume and provide nutrients that benefit bone health. After cleaning, eggshells can be added to any brewing method or even used in a Minnesota coffee tradition with a whole egg.
Adding crushed eggshells to coffee grounds can reduce the beverage's bitterness due to the alkalinity of calcium carbonate found in the shells, creating a smoother taste.
Eggshells are safe to ingest and contain beneficial nutrients like calcium carbonate, fluoride, and magnesium, promoting good bone health.
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