It seems like the winter season always returns before we expect it!. And we all know the best way to deal with winter is to stay healthy in the first place. Designed to provide round the clock support, Reacta-C is a patented form of Vitamin C and strontium that is designed to deliver vitamin C over an extended period for greater immune support! For a vitamin C formula that just works better, Solaray has created a nutrient rich complex of strontium ascorbate and calcium ascorbate with l-threonate. The result is a non-acidic formula that is fast-acting and long-lasting, all while being gentle on the stomach. We've also added Bioflavonoids to enhance the effect of vitamin C, and other key ingredients to create a synergistic support base for maximum bioavailability and effectiveness. Reacta-C is non-GMO, vegan and lab verified for potency, purity and identity. Give your immune system the boost it needs so you can Live Brighter!