Est 1973 + Immune System Dietary Supplement Lab Verified Vegan A Brighter Way Discussion: This two-staged, timed-release formula is designed to release half of the Vitamin C rapidly and the other half gradually throughout the day** which may help extend the availability of vitamin C to the body over a longer period to help support the body's immune system. Since 1973, we've scoured the globe for the highest quality ingredients, connecting you with the most efficacious supplements that help you live brighter & embrace the moments that matter most. **Based on in-vitro dissolution tests designed to simulate the digestive process. Individual results may vary.