The serum is the go-to for firm, radiant and even complexion and contains the optimal concentration of 5% Vitamin C in a stable form that is easily absorbed, safe and gentle on the skin. THE GOOD C VITAMIN C SERUM has an active ingredient complex that includes oil-soluble Vitamin C THD, stabilized, synthetic Vitamin C in glucosidic form and an extract from Kakadu Plum, a fruit that is a potent source of plant-based Vitamin C. Together, they help to reduce uneven pigmentation, improve tone and provide anti-oxidative protection from free radicals and environmental stressors for a youthful and healthy-looking complexion. The serum also contains Zinc, which helps to increase the absorption of Vitamin C into the skin. Finally, Vitamin C supports the formation of collagen, which is needed for firm and youthful-looking skin. " “I developed THE GOOD C VITAMIN C SERUM in response to clients who wanted the radiance boosting effects of Vitamin C in an optimum concentration, without damaging skin barrier function or causing sensitivity. My formulation combines the right chemistry of Vitamin C with surrounding ingredient science to boost the skin and provides antioxidant properties that protect from free radicals and daily environmental stress while combatting pigmentation. Regular usage results in a complexion that’s healthy-looking, fresh and radiant." - DR. BARBARA STURM.