Tatcha The Dewy Serum is a luxurious 3-in-1 facial serum designed to resurface, plump, and deeply moisturize skin in a single daily step. At the heart of the formula is Tatcha's proprietary Hadasei-3™ complex — a fermented blend of Japanese green tea (Camellia Sinensis), rice, and Okinawa algae (Cladosiphon Okamuranus) — delivering the brand's signature approach to clean, kind-to-skin ingredients inspired by Japanese beauty rituals. Suitable for all skin types, it imparts visibly smoother, plumper, and dewier skin with consistent use.

The serum works through three complementary mechanisms: lactic acid within the Hadasei-3™ complex gently resurfaces uneven texture; sodium hyaluronate draws moisture deep into skin layers for lasting plumpness; and squalane forms a protective barrier that seals hydration in place. The formula is further enriched with hydrolyzed collagen and elastin for suppleness, ascorbyl tetraisopalmitate (a stable vitamin C derivative) for brightening, and stearyl glycyrrhetinate for a soothing, calming effect on skin.

The formula is free of parabens, sulfates (SLS), talc, lanolin, propylene glycol, and common preservatives. It is also gluten free, soy free, and nickel free, with a SkinSAFE rating of 91 out of 100. This Costco offering contains 1.0 fl oz (30 g) at a value versus the standard retail price of $89.00.