Tatcha's proprietary fermentation-derived complex of Akita rice, Uji green tea, and Okinawa algae — the formulation backbone of the brand's hero Dewy Skin Cream and Essence. Trademarked by Tatcha; the constituent ferments are well-documented but the proportions and processing are proprietary. Notable as the moment a Japanese ferment narrative crossed into U.S. luxury skincare.
Benefits
polyphenol antioxidant load (green tea catechins)
rice ferment postbiotic activity
marine algae polysaccharide humectancy
Example uses
hydrating creams (Tatcha Dewy Skin Cream)
essences
hero serums
Mechanism of action
Tatcha's trademarked complex of three Japanese-origin ferments: Akita rice ferment (Saccharomycopsis-fermented rice broth, contributing polyphenols, organic acids, and amino-acid NMF substrates), Uji green tea ferment (catechin-derived antioxidant load), and Okinawa Mozuku algae ferment (fucoidan polysaccharide humectancy with mild anti-hyaluronidase activity). The mechanism is the sum of three well-characterised ferment categories rather than a novel pathway. The brand claim is that the proprietary ratio and processing produce a synergistic profile beyond the sum of the parts; the constituent ferments are individually available unbranded.
Clinical evidence · Emerging
Brand-internal clinical studies on hydration and barrier endpoints; the constituent ferments (rice, tea, algae) carry stronger independent literature; the complex-as-such has limited third-party data.
Effective concentration range
Proprietary (undisclosed)
Formulation notes
Proprietary blend — concentration not disclosed. Used as the active backbone in Tatcha's hydration and barrier portfolio. The component ferments (rice, tea, algae) are widely available unbranded for indie formulators wanting a similar profile.
Watchouts
Brand-trademarked complex — performance claims are tied to Tatcha's clinical work and not transferable. Verify the specific formula's claim, not the complex name.
Proprietary trademarked complexes are a structural transparency problem in clean beauty — concentration is undisclosed, the ratio is undisclosed, and the clinical evidence is brand-owned. The performance of any Hadasei-3 product cannot be evaluated independently of Tatcha's specific finished-formula trials, which makes it functionally untestable by consumers and reviewers.
Market positioning
Sold as the heritage-Japan luxury ferment innovation. Honest position: a competent multi-ferment blend wrapped in compelling cultural storytelling; the constituent ferment categories are available across the K-beauty mid-market at a fraction of the price.