Elixir The Serum aa 50ml is a quasi-drug medicated beauty serum for mature skin with simultaneous concerns of dryness-related wrinkles, dark spots, and firmness decline — using Coreximide (Shiseido's proprietary peptide that works at the basement membrane level) and Tranexamic Acid in a single serum that replaces multiple specialist products. Developed under Shiseido's Elixir research with 21 beauty ingredients formulated to address multiple aging signs in one daily application. Coreximide (Hydroxyethylethyleneurea) — Shiseido-exclusive active that targets the skin's basement membrane to restore foundational firmness and density Tranexamic Acid — quasi-drug certified brightening active that suppresses melanin production at the prostaglandin signal level 21 beauty ingredients — comprehensive formulation including hyaluronic acid, collagen, ceramide, and botanical extracts in one serum Fast-absorbing milky serum texture — penetrates quickly even on days when a full multi-step routine is abbreviated 50ml pump — generous size for a prestige quasi-drug serum; approximately 2–3 months of twice-daily use Japan-domestic quasi-drug classification — regulated efficacy standards beyond standard cosmetic serums How it works: Coreximide operates at the dermal-epidermal junction — the basement membrane that anchors the epidermis to the dermis. This junction weakens with age, causing the epidermis to lose its structural anchorage and creating the "drooping" quality of aging skin. Coreximide supports the proteins that maintain basement membrane integrity — a different approach from surface-applied peptides or collagen that cannot reach this structural layer. Combined with Tranexamic Acid for brightening, the serum addresses both structural and pigmentary aging simultaneously.Elixir The Serum aa vs standard anti-aging serums: The Coreximide basement membrane target is the functional differentiator — it addresses a structural level that most serums do not reach. For mature skin where surface-applied serums have plateaued in their visible effect, The Serum aa's basement membrane approach represents a mechanistically different intervention. The quasi-drug status means Tranexamic Acid is regulated at efficacy levels above cosmetic brightening serums.Known in Japan as エリクシール シュペリエル ザ セラム ａａ 50mL.
