What Is Bacillus/Diospyros Kaki Leaf/Soybean Ferment Extract Filtrate?
Bacillus/Diospyros Kaki Leaf/Soybean Ferment Extract Filtrate comes from a gentle fermentation process that blends persimmon leaves (Diospyros kaki) and soybeans (Glycine max) with the friendly bacterium Bacillus subtilis. During fermentation the plant material breaks down, releasing small bio-active molecules like amino acids, peptides, flavonoids, organic acids and natural sugars. These are then filtered to remove solids leaving a clear liquid, or filtrate, packed with skin-loving nutrients.
Persimmon leaves have been used in East Asian tea and folk beauty rituals for centuries while fermented soy has long been prized for its smooth feel on skin and hair. Scientists combined the two with Bacillus subtilis to harness the antioxidant power of persimmon plus the conditioning benefits of soy in one stable ingredient. The resulting filtrate started appearing in cosmetic labs in the early 2000s as brands searched for multitasking plant ferments with a clean-beauty story.
The filtrate is produced in a controlled fermenter where leaf and soybean extracts mingle with Bacillus subtilis under warm aerated conditions. After several days the mixture is pressed and micro-filtered, yielding a lightweight liquid that blends easily into water-based formulas.
You will mainly spot Bacillus/Diospyros Kaki Leaf/Soybean Ferment Extract Filtrate in facial masks, hydrating serums, anti-aging creams, calming toners, scalp tonics and color-safe hair conditioners. Its broad skill set lets formulators add it to both rinse-off and leave-on products for skin and hair care.
Bacillus/Diospyros Kaki Leaf/Soybean Ferment Extract Filtrate’s Cosmetic Benefits/Uses
This fermented filtrate serves several roles that can boost the performance of a beauty product:
- Antimicrobial – helps keep the formula fresh by limiting the growth of unwanted microbes which can extend shelf life and reduce the need for stronger preservatives
- Antioxidant – delivers plant-derived compounds that neutralize free radicals supporting skin’s defense against dullness and early signs of aging
- Hair Conditioning – coats strands with lightweight proteins and sugars that smooth the cuticle for softer shinier hair and easier detangling
- Skin Conditioning – supplies moisture-binding amino acids and gentle acids that leave skin feeling hydrated comfortable and supple
Who Can Use Bacillus/Diospyros Kaki Leaf/Soybean Ferment Extract Filtrate
This ferment is generally gentle enough for all skin types including dry, oily, combination and mature skins. Its lightweight water-based texture will not clog pores which makes it a friendly option for acne-prone or sensitive complexions as well. Those with soy allergies, however, should approach with caution since trace soy proteins may remain after filtration and could trigger a reaction.
The ingredient is plant derived and bacteria fermented with no animal by-products so it aligns with vegan and vegetarian lifestyles.
Current research shows no specific concerns for topical use during pregnancy or while breastfeeding. That said this is not medical advice and expecting or nursing parents should always clear any new skincare product with their healthcare provider.
Bacillus/Diospyros Kaki Leaf/Soybean Ferment Extract Filtrate does not increase photosensitivity so it can be used day or night without extra risk of sun reaction. As with any cosmetic it works best when paired with daily sunscreen for overall skin health.
Potential Side Effects/Adverse Reactions
Side effects from topical Bacillus/Diospyros Kaki Leaf/Soybean Ferment Extract Filtrate vary from person to person. The points below outline potential reactions but most users will not experience them when the ingredient is correctly formulated in a product.
- Mild redness or stinging in very sensitive skin during the first few uses
- Allergic response in individuals with soy or persimmon leaf sensitivities
- Contact dermatitis if applied to broken or compromised skin barriers
- Eye irritation if the product accidentally gets into the eyes
If any irritation or unexpected reaction occurs discontinue use and seek advice from a qualified healthcare professional.
Comedogenic Rating
Rating: 1/5. This filtrate is primarily water based with only trace levels of oils or fatty acids so it has little tendency to block pores. Fermentation breaks larger plant molecules into lightweight components that rinse away easily which further limits build-up on the skin. In most formulations it should not aggravate clogged pores or blackheads.
Suitable for acne-prone skin.
As with any ingredient the final product formula matters; pairing the filtrate with heavy oils or waxes could raise overall comedogenicity even though the ferment itself is low risk.
Summary
Bacillus/Diospyros Kaki Leaf/Soybean Ferment Extract Filtrate works as an antimicrobial preservative booster that quietly keeps formulas fresh, an antioxidant that helps fend off free radicals, a skin conditioner that tops up moisture with amino acids and organic acids, and a hair conditioner that smooths the cuticle for softer shinier strands. It does this thanks to the small bio-active molecules released during Bacillus subtilis fermentation which are easily absorbed and gentle on skin and hair.
While not yet a mainstream household name the ingredient is gaining traction in clean beauty circles and K-beauty inspired products because it offers multiple benefits in one plant-based source.
Current data show it is safe for topical use for most people with the main caution being those who are sensitive to soy or persimmon leaves. As always try a small patch first when testing any new product that contains this ferment just to be on the safe side.