Lightweight, oil-free serum that calms and conditions skin with an antioxidant blend plus Phytonadione, a potent form of Vitamin K and Arnica Montana Extract, a natural botanical extract that soothes skin and reduces the appearance of redness. Design house: Revision. Series: Vitamin K Serum. Gender: Unisex. Category: Skin Care. SubType: Oil & Serums. Size: 0.5 oz. Barcode: 640451115016. Vitamin K Serum by Revision for Unisex - 0.5 oz Serum.