Vitamin C Day Serum - Brightening, Hydrating and Firming! Vitamin C a powerful antioxidant but its benefits don't just stop there! Vitamin C also increases skin vitality and resilience by up-regulating collagen production. In this product we have paired a stable, skin-compatible vitamin C with a range of ingredients that work together to brighten, hydrate and firm the skin. Key Ingredients: Brightening: Vitamin C Isopalmitate, Kakadu Plum Extract, Bearberry Leaf Extract. Hydrating: Sodium Hyaluronate, Jojoba Oil, Cranberry Extract, Bilberry Extract. Firming: (Progeline) Trifluoroacetyl Tripeptide-2, Heptapeptide-8.