Citric acid is a natural, plant-derived acid, abundant in lemons, that plays an essential role in cosmetic formulations. It acts as a pH adjuster, helping to correct overly high pH levels and maintain the skin’s slightly acidic balance, which is crucial for limiting bacterial and fungal growth. It is also used to create effervescent products, such as bath bombs, bath melts, or “magic powders,” in combination with sodium bicarbonate. This chemical reaction provides a fizzy effect while respecting the skin’s protective barrier and making cosmetics both attractive and sensory. For household use, citric acid is well known for its descaling and cleaning properties. It can be used to descale coffee machines, kettles, and washing machines, remove limescale or cement deposits from surfaces, eliminate rust stains from fabrics and metal objects, and effectively clean stainless steel, chrome, ceramic, or plastic surfaces. Easy to use, it simply needs to be dissolved in hot water to enjoy its effects.