Youth Essentia Kit #4C quence #4 kit contains the highest concentration of vitamins A and C and is the final step in the Ionzyme range step up system. Additional vitamin C is added to the serum by including Environ c boost to your regimen, improving the overall radiance of the skin, and appearance of a more refined tone. Also included is the c quence eye gel, a technologically advanced gel that contains essential vitamins A & C, antioxidants and specially selected