Dr. Barbara Sturm The Good C THE GOOD VITAMIN CC SERUM is the latest serum invention by Dr. Barbara Sturm containing una unique blend of vitamin C in three skin-friendly forms una Concentration that is easily absorbed, safe, and gentle on the skin. The serum contains a complex of active ingredients that includes vitamin C. THD oil-soluble, synthetic stabilized vitamin C in glucoside form and an extract of Kakadu plum, a fruit that is una powerful source of vitamin C. reduce signs of uneven pigmentation and improve tone, also providing una Antioxidant protection against environmental stressors for a radiant and even complexion. The serum also contains zinc, which increases the absorption of vitamin C into the skin. Additionally, vitamin C supports collagen formation, which is necessary for una firm, youthful-looking skin. GOOD VITAMIN CC SERUM contains una A 5% concentration of vitamin C is safe and gentle on the skin. Higher concentrations do not remain stable on the skin, triggering inflammation and damaging the skin's barrier function.