Citric Acid - Occurs naturally in citrus fruits. It is one of the main ingredients in bath bombs. Derived from fermented corn and sugar beets, it is GMO fee. Citric Acid is often used to alter pH levels which makes it useful as a natural preservative for some products. also used to balance PH levels in lotions, creams as well as liquid soap. It may be found in some preservative formulations for creams and lotions.