iS Clinical Vitamin C formulations feature both pharmaceutical-grade L-Ascorbic Acid and advanced Vitamin C derivatives to address a variety of skin concerns and preferences. These formulations help support the appearance of brighter, more even-toned skin while delivering antioxidant protection against environmental stressors. Each product in this collection reflects the brand's commitment to formulation excellence, pairing Vitamin C technologies with complementary antioxidants for comprehensive skin support.

Pro-Heal Serum Advance+ is the cornerstone of the collection, combining pharmaceutical-grade L-Ascorbic Acid with Olive Leaf Extract and Vitamin E for advanced antioxidant support. This serum is designed to support the appearance of calm, resilient-looking skin while delivering powerful Vitamin C benefits. For a stabilized Vitamin C alternative, GeneXC Serum features advanced antioxidant technology and stable Vitamin C to support visible brightening and antioxidant protection.

Targeted Vitamin C support extends to the eye area with C Eye Serum Advance+, formulated specifically for the delicate skin around the eyes. This concentrated formula supports the appearance of brighter, smoother-looking skin where signs of fatigue show first.

Every iS Clinical Vitamin C product is formulated with stability as a priority — pharmaceutical-grade actives that maintain their potency from first use to last. Trusted by dermatologists and estheticians in 120+ countries, these formulations fit within the Treat step of the Cleanse, Treat, Hydrate, Protect regimen.

Explore the full serums collection for additional treatment options, or find your ideal regimen with the skincare recommendation quiz.