Doctor s Best(R) High Absorption Vitamin C with PureWay-C(TM) delivers 500 mg of the most advanced form of vitamin C available. This sustained-release formula features vitamin C lipid metabolites. Lab studies show that PureWay-C has superior uptake bioavailability and retention in cells as well as more potent free radical scavenging capabilities than other forms of vitamin C. This increased bioavailability means PureWay-C has the potential to more potently support healthy neuron function and enhanced immune system activity as compared to other forms of vitamin C. PureWay-C is non-GMO gluten free and soy free. Vegan.