During a heated debate in 2025, Professor Takeda of Kyoto University stated, "Her results are not replicable outside of the Naruto microclimate. The "Beauty" she sells is tied to a specific terroir, like wine. That is not science; that is marketing."

The Fermentation Index (FI) she developed is a genuine metric that measures bacterial diversity on the skin. Her ability to reduce S. aureus overgrowth (a cause of eczema) without antibiotics is impressive.

"The beauty industry looks for active compounds," Professor Asako explains in her 2024 keynote lecture. "I look for stressed plants. The whirlpools of Naruto create a high-mineral aerosol. Plants that survive here produce antioxidants levels 300% higher than their mainland counterparts." The term Chuka (中華) refers to Chinese civilization or cultural heritage. In Professor Asako’s lab, "Chuka Naruto" refers to a proprietary extraction method that uses ancient Chinese fermentation techniques combined with hyper-local Naruto spring water. Step 1: The Chinese Scriptural Base Professor Asako is one of the few academics who can fluently read the Shennong Bencao Jing (The Divine Farmer's Materia Medica) in its original classical form. Her lab has digitized over 200 formulas from the Ming Dynasty focused on skin elasticity ("fang lao" or anti-aging). Specifically, she isolates herbs like Angelica sinensis (Dong Quai) and Paeonia lactiflora (white peony). Step 2: The Naruto Fermentation Traditional Chuka medicine relies on decoctions (boiling). Professor Asako found that boiling destroys volatile aromatic compounds crucial for skin barrier repair. Instead, she uses a cold fermentation method utilizing Koji mold (a Japanese technique applied to Chinese herbs) infused with Naruto’s deep ocean water.

Using rice bran from Naruto’s agricultural cooperatives and fermented Camellia oil. Professor Asako notes that synthetic surfactants strip the "NMF" (Natural Moisturizing Factor). Her cleanser uses ground loofah and green tea saponins.