High potency, non-irritating The Organic Pharmacy Stabilised Vitamin C Serum targets dullness, uneven skin tone and signs of ageing. Vitamin C has been shown to reverse multiple signs of ageing and boost collagen production. Use on its own or as a combination treatment with Four Acid Peel, Hyaluronic Acid or Retinol Night Serum Clinical Test Results: - Clinically proven to increase moisturisation (+19%) and brightness (+10%) as assessed after 28 days of twice a day application. - Clinically proven to progressively increase collagen density (up to 12.9%) as assessed over 60 day period of in vivo study.