What Is Natto Gum?
Natto gum is a plant-based polymer obtained when the friendly bacterium Bacillus natto ferments soy protein. During this process the bacteria break down the protein and spin out long chains of amino-acid-rich molecules that behave like a soluble, silky gel. First celebrated in Japan as the sticky component of the traditional food natto, these strands were noticed for their impressive ability to hold water and create a smooth film, leading formulators to explore them for skin and hair care. To manufacture cosmetic-grade natto gum, food-quality soybeans are steamed, inoculated with Bacillus natto, and left to ferment under controlled temperature and humidity. The resulting viscous mass is then filtered, purified, and gently dried into a fine, off-white powder that disperses easily in water-based systems. Thanks to its natural origin and pleasant skin feel, natto gum now appears in leave-on and rinse-off products such as hydrating sheet masks, lightweight moisturizers, anti-aging serums, soothing gels, hair conditioners, and styling creams.
Natto Gum’s Cosmetic Benefits/Uses
Natto gum brings one primary yet highly valued action to cosmetic formulas.
- Film forming – when applied, natto gum creates an invisible, flexible layer on the skin or hair. This micro-film slows water loss so skin stays dewy longer, smooths the surface for a soft touch, helps actives stay in place, and lends a subtle tightening effect that can make fine lines look less obvious. In hair care the same film tames frizz and adds light hold without stiffness.
Who Can Use Natto Gum
Natto gum is generally suitable for all skin types. Dry or dehydrated skin benefits from its moisture-locking film, sensitive skin appreciates its gentle plant origin and oily or combination skin tends to tolerate its lightweight texture without feeling greasy. Those with a known soy allergy should proceed cautiously since the material is derived from soy protein.
The ingredient is completely plant based and the fermentation process does not involve animal derivatives, making it appropriate for vegans and vegetarians.
Current evidence does not point to any specific concerns for pregnant or breastfeeding women when natto gum is used topically. That said, this information is not medical advice and anyone who is expecting or nursing should review all skincare products with a qualified healthcare provider.
Natto gum is not known to cause photosensitivity, so it will not make skin more prone to sunburn. It is compatible with common actives and works well in both leave-on and rinse-off formulas.
Potential Side Effects/Adverse Reactions
Responses to topical natto gum vary from person to person. The effects listed below are possible yet uncommon when the ingredient is properly formulated and used as directed.
- Allergic reaction in individuals sensitive to soy
- Mild redness or irritation on very reactive skin
- Temporary stickiness if applied in high concentrations
- Build-up or dullness on hair when overused in styling products
If any discomfort, rash or other adverse effect occurs, discontinue use and consult a healthcare professional.
Comedogenic Rating
Rating: 1/5. Natto gum sits near the non-comedogenic end because its large, water-loving molecules stay on the surface and rinse away easily rather than sinking into pores. The lightweight film it forms does not supply oils that could clog follicles, though extremely heavy formulations that layer multiple film formers could still feel occlusive on very oily skin. Overall it is considered suitable for people prone to acne or breakouts.
Because natto gum is usually used at low percentages and pairs well with water-based systems, the risk of pore blockage remains low even in leave-on products.
Summary
Natto gum works chiefly as a film former. Once hydrated it spreads into a thin, flexible veil that slows moisture loss, leaves skin and hair feeling silky and helps active ingredients stay put. This simple action supports hydration, reduces the look of fine lines and offers light frizz control in hair care.
The ingredient enjoys modest popularity; it appears regularly in Japanese and Korean formulas and is starting to pop up in global indie brands, but it has not yet achieved the name recognition of hyaluronic acid or glycerin.
Topically, natto gum is considered safe for most users. Reported reactions are rare and typically linked to soy sensitivity. As with any new cosmetic ingredient it is wise to perform a small patch test when first trying a product that contains it, just to be safe.