There is a specific kind of skin situation this toner was made for: tight after cleansing, prone to rough patches, uncomfortable in cold or windy weather, and easily upset by stress. Kansosan is a BCL brand built around one core conviction — that most skin problems start with dryness — and the Medicated Deep Moisturizing Toner is the most concentrated hydration product in the line. Its standout ingredient is Heparin-Like Substance (ヘパリン類似物質), a medicated moisturiser well-known in Japanese pharmacology for its ability to restore water retention in compromised skin. Alongside it, human-identical ceramide (N-Stearoyl Dihydrosphingosine) reinforces the lipid barrier from within, while a nanocapsule delivery system uses a Vitamin E derivative to encapsulate a Vitamin B6 derivative and carry it deeper into the skin. The texture has a gentle, slip-forward viscosity — not watery, not gel-heavy — that spreads easily and absorbs without a sticky finish. Fragrance-free, alcohol-free, silicone-free, and paraben-free, with allergy-patch testing completed. This is the toner for anyone who has tried "gentle" and still finds their skin reacting — and wants something that actually addresses the root cause rather than masking it.