{"product_id":"obagi-professional-c-20-serum-30ml","title":"Obagi Professional-C 20% Serum 30ml","description":"\u003cp\u003eThe strongest vitamin C serum Obagi makes. At 20% pure L-ascorbic acid in a stable, low-pH formulation engineered to penetrate the dermis, Professional-C 20% delivers the most potent antioxidant protection and brightening activity available in the range. This concentration sits at the upper threshold of what clinical research shows to be effective for topical vitamin C — beyond which additional concentration yields diminishing returns.\u003c\/p\u003e\n\u003ch3\u003eWhat it does:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMaximum-strength antioxidant protection against UV-induced free radical damage\u003c\/li\u003e\n\u003cli\u003eVisible brightening and pigmentation correction, typically from 4 weeks of consistent use\u003c\/li\u003e\n\u003cli\u003eStimulates dermal collagen synthesis at the highest effective dose\u003c\/li\u003e\n\u003cli\u003eEnhances skin radiance, luminosity, and overall tone clarity\u003c\/li\u003e\n\u003cli\u003eSynergistic protection when paired with broad-spectrum SPF\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Experienced vitamin C users with normal to oily skin who have established tolerance at 10% or 15% and want the maximum clinical benefit. Particularly effective for patients targeting photodamage, stubborn pigmentation, and advanced collagen support. If 20% causes irritation, step back to the \u003ca href=\"\/products\/obagi-professional-c-15-serum-30ml\"\u003e15% formulation\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to use:\u003c\/strong\u003e Apply 5–7 drops to clean, dry skin each morning. Allow to absorb for 1–2 minutes before layering moisturiser and SPF. Store in a cool, dark place. Discard if the serum turns dark brown or orange.\u003c\/p\u003e","brand":"Obagi Medical","offers":[{"title":"Default Title","offer_id":63637588771165,"sku":"OBA-PC20-30","price":170.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1051\/2839\/5101\/files\/ProC-Serums-Cartons_Group_BlackTops_2015.png?v=1777331587","url":"https:\/\/stratumclinic.co.uk\/products\/obagi-professional-c-20-serum-30ml","provider":"Stratum Clinic","version":"1.0","type":"link"}