Cornstarch is a silky, plant-based powder made from the starch of corn kernels. In cooking, it thickens sauces. In skincare, it’s a surprisingly smart support ingredient. We use it in our shower steamer dust to help the powder stay fluffy and free-flowing, so you can sprinkle it with ease. But even more importantly, it slows the reaction between the citric acid and baking soda which makes your steamer fizz more gently and last longer.

That slower dissolve means the scent of essential oils unfolds gradually throughout your shower instead of all at once. It's a simple ingredient that helps create a more relaxing, longer-lasting aromatic experience; all without adding anything synthetic or harsh.