Natto Gum

Derived from a traditional Japanese fermentation process, Natto Gum is a natural polysaccharide produced when soybeans are fermented by the beneficial bacterium *Bacillus subtilis* (often referred to as *Bacillus natto*). This sticky, viscous substance is actually the same slimy, thread-like material that gives the fermented soybean dish natto its characteristic texture. Chemically, it is composed primarily of a high-molecular-weight polymer called poly-gamma-glutamic acid (γ-PGA), along with smaller amounts of polysaccharides and other fermentation byproducts. Unlike many synthetic film-forming agents, Natto Gum is entirely biodegradable and derived from a renewable plant source, making it an appealing option for formulators seeking natural or bio-based alternatives.

In cosmetics, Natto Gum functions primarily as a film-forming agent, meaning it creates a thin, flexible, and breathable layer on the skin or hair after application. When applied, the poly-gamma-glutamic acid molecules align and dry down to form a continuous, elastic film that adheres to the surface. This film can help smooth the appearance of fine lines, improve the texture of makeup or skincare products, and provide a temporary tightening effect. Formulators typically use it at concentrations ranging from 0.1% to 2%, depending on the desired film thickness and viscosity. Because it is water-soluble and easy to incorporate, it works well in serums, gels, masks, and setting sprays without leaving a tacky or sticky residue.

The primary benefit of Natto Gum in skincare is its ability to create a smooth, even, and taut appearance on the skin, often described as a "second skin" effect. This can help blur the look of pores, fine lines, and uneven texture, making it a popular ingredient in primers, pore-minimizing treatments, and anti-aging formulations. Additionally, because the film is breathable and non-occlusive, it does not clog pores or interfere with the skin's natural barrier function. Some research also suggests that poly-gamma-glutamic acid has mild humectant properties, meaning it can attract and hold moisture from the environment, offering a subtle hydrating benefit. While the evidence for its anti-aging effects is primarily anecdotal and based on its physical film-forming ability rather than biological activity, many users report a visible immediate improvement in skin smoothness and firmness.

Natto Gum is exceptionally gentle and well-tolerated, making it suitable for all skin types, including sensitive, oily, and acne-prone skin. Unlike some synthetic film-formers (such as acrylates copolymers), it does not tend to pill or ball up when layered with other products, and it is compatible with a wide range of ingredients, including hyaluronic acid, niacinamide, peptides, and antioxidants. However, because it creates a film, it may not be ideal for use under heavy occlusive creams or oils, as this could interfere with the film's integrity. There are no known significant limitations or safety concerns—it is non-irritating, non-sensitizing, and generally recognized as safe for topical use. That said, individuals with soy allergies should be aware that it is derived from soy fermentation, though the protein content is typically minimal and allergic reactions are extremely rare.

When shopping for products containing Natto Gum, look for it listed as Natto Gum or Polygamma-Glutamic Acid on ingredient labels, often appearing in primers, setting sprays, sheet masks, and anti-aging serums. It is also sometimes referred to as Bacillus/Natto Gum Ferment or simply γ-PGA. A fun fact: the sticky texture of natto is so strong that it can be used as a natural glue in some traditional Japanese crafts! In cosmetics, this same stickiness translates into a lightweight, flexible film that feels almost invisible on the skin. Because it is a natural fermentation product, the consistency and film-forming properties can vary slightly between batches, but reputable suppliers ensure consistent performance. If you enjoy the immediate smoothing effect of silicone-based primers but prefer a more natural, biodegradable alternative, Natto Gum is an excellent option to try.