The Ultimate Biome Spritz is more potent than Tone + Hydrate Spritz and designed to protect and improve the health of the skin where the biome may be compromised. Because of the Vitamin C content it is also helpful for boosting your skin cells’ defence against free radicals (caused by pollution, too much sun, stress etc.), and stimulating collagen and hyaluronic acid synthesis. It also provides more hydration than the Tone + Hydrate Spritz because of the addition of hyaluronic acid. It’s basically Tone + Hydrate Spritz on steroids!