What Is Bacillus/Monascus/Mallotus Japonicus Leaf/Soybean Ferment Filtrate?
Bacillus/Monascus/Mallotus Japonicus Leaf/Soybean Ferment Filtrate is a liquid obtained after fermenting soybeans and the leaves of the Mallotus japonicus tree with two friendly microorganisms, Bacillus and Monascus. During this process the microbes break down proteins, fats and sugars into smaller pieces such as amino acids, peptides, enzymes and gentle organic acids. These tiny molecules are easier for skin to use and often bring added soothing and balancing effects. The idea of harnessing fermented soy is not new; Asian cultures have used soy fermentation for food and skin benefits for centuries. Modern labs took that know-how, added Mallotus japonicus for its antioxidant rich leaves, and refined the mixture to create a light, clear filtrate suitable for skincare.
To make it, cleaned soybeans and leaf extracts are mixed with water and steamed, cooled, then inoculated with selected Bacillus and Monascus strains. The blend ferments under controlled temperature and pH until it reaches the desired activity level. It is then filtered to remove solids, leaving a smooth liquid that is further purified and preserved.
The filtrate’s light texture lets formulators slip it into many products such as mattifying toners, oil-control serums, lightweight gels, daily moisturizers, sheet masks and spot treatments aimed at shiny or combination skin. Because it offers both conditioning and sebum-regulating properties, it often shows up in multi-tasking formulas that promise balanced yet soft skin.
Bacillus/Monascus/Mallotus Japonicus Leaf/Soybean Ferment Filtrate’s Cosmetic Benefits/Uses
This ingredient brings a trio of helpful actions to personal care formulas
- Anti-Sebum: Helps reduce excess oil on the surface of the skin, promoting a fresher matte finish and potentially keeping pores from looking enlarged.
- Skin Conditioning: Supplies amino acids and antioxidants that support a smooth, supple feel, leaving skin softer and more comfortable.
- Emollient: Adds a light layer of moisture that prevents dryness without feeling heavy so skin stays hydrated and calm.
Who Can Use Bacillus/Monascus/Mallotus Japonicus Leaf/Soybean Ferment Filtrate
The filtrate works best for oily, combination and normal skin thanks to its light texture and oil balancing effect. Dry or very dry skin can still use it but may need a richer cream on top because the ingredient alone will not supply heavy moisture.
Because the source materials are plant based and the fermentation relies on microorganisms rather than animal products, the ingredient is suitable for both vegans and vegetarians.
No specific safety issues are noted for pregnant or breastfeeding women. That said this is not medical advice and anyone who is expecting or nursing should show their skincare routine to a health professional before use just to be safe.
The filtrate does not make skin more sensitive to sunlight and can be used morning or night without raising the risk of sunburn.
People with a known soy allergy should approach formulas containing this ingredient carefully, as trace soy proteins could still be present.
Potential Side Effects/Adverse Reactions
Reactions to topical Bacillus/Monascus/Mallotus Japonicus Leaf/Soybean Ferment Filtrate differ from person to person. The points below list possible side effects that may occur in rare cases. Most users will enjoy the ingredient without any problems when it is used correctly in a well-made product.
- Skin irritation such as redness stinging or itching
- Allergic response in individuals sensitive to soy
- Mild dryness or tightness if used alone on very dry skin types
- Contact dermatitis in those with compromised skin barriers
If any discomfort or unusual reaction appears stop using the product immediately and seek advice from a dermatologist or healthcare provider.
Comedogenic Rating
Rating: 1 / 5
This filtrate is almost entirely water based and contains very little oil or wax, so it is unlikely to clog pores. The small amount of naturally occurring lipids from soy may account for a minimal risk, which is why it is rated a 1 rather than a perfect 0.
That makes it generally suitable for skin that is prone to acne or breakouts.
Because the ingredient can help regulate excess sebum, it may even support a clearer look when used in well-balanced formulas.
Summary
Bacillus/Monascus/Mallotus Japonicus Leaf/Soybean Ferment Filtrate offers three main perks: it tempers excess oil for a matte finish, softens and comforts the skin with amino acids and antioxidants, and provides a light emollient touch that keeps moisture in without heaviness. These benefits come from the fermentation process that breaks soy and leaf compounds into smaller, skin-friendly molecules.
While not yet a household name, it is gaining traction in K-beauty and niche clean brands that value fermented actives and gentle oil control. Its mild nature means most users tolerate it well, and adverse reactions are rare. Still, everyone’s skin is different, so it is wise to patch test any new product that lists this ferment on the label before applying it all over.