Once dissolved in water, bath bombs release citric acid which fizzes up and helps loosen damaged layers of skin. The oils in bath bombs also tend to be super moisturizing, and basking in a tub of hydrating oils will leave your skin feeling soft and supple. Cocoa butter is high in fatty acids, which is why it's often touted for its ability to hydrate and nourish the skin and improve elasticity. The fat in cocoa butter forms a protective barrier over skin to hold in moisture. Cocoa butter is also rich in natural plant compounds called phytochemicals. Citric Acid has protective antioxidant, and corrective antiaging effects helping to reverse visible signs of photodamage. Citric Acid works by exfoliating the upper layer of dead skin cells to help clean pores, even skin tone and soften and smooth the skin. The coarse texture of Epsom salt may help exfoliate skin by removing dead skin cells. Sodium bicarbonate, is an alkaline substance helpful in managing pH levels. ... Baking soda also contains anti-inflammatory and antiseptic properties.