Ingredient review

Fermented Persimmon & Soybean Extract

INCI: Bacillus/Diospyros Kaki Leaf/Soybean Ferment Extract Filtrate

A fermented botanical extract that may help calm skin and fight free radicals, though research is still early.

beautyskincareantioxidant

In plain English

This ingredient is made by fermenting persimmon leaves and soybeans with a type of friendly bacteria (Bacillus). The fermentation process breaks down the plant materials into smaller, more active compounds that can be easier for skin to use. It's thought to have antioxidant effects (helping protect skin from environmental damage) and soothing benefits, but most of the evidence comes from lab studies, not large human trials.

Quick decision guide

Useful, but context matters

Fermented Persimmon & Soybean Extract is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Fermented Persimmon & Soybean Extract.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

emerging

The ingredient may be promising, but claims should be treated more cautiously.

What it is

A filtrate from a fermentation process using Bacillus bacteria on persimmon (Diospyros kaki) leaves and soybeans. The result is a liquid extract rich in peptides, amino acids, and polyphenols.

How it works

The fermentation creates bioactive peptides and antioxidants that can help neutralize free radicals on the skin's surface. It may also support the skin's natural barrier by providing amino acids that help maintain hydration and calm irritation.

Pros

Gentle antioxidant

Provides free-radical protection without the irritation that some stronger antioxidants can cause, making it suitable for sensitive skin.

Soothing potential

Early research suggests it may help calm redness and irritation, which is helpful for reactive skin types.

Cons and cautions

Limited evidence

Most benefits are supported by lab studies rather than large clinical trials on humans, so results may vary.

Allergen risk

Since it's derived from soy, individuals with soy allergies should patch test before use.

Best for

  • People looking for gentle antioxidant support
  • Those with sensitive or reactive skin who want soothing ingredients

Use caution if

  • Anyone with a known allergy to soy or persimmon should patch test first

Usage tips

Use in a serum or essence after cleansing and before heavier moisturizers.
Store products containing this ingredient in a cool, dark place to preserve the active compounds.

Safety summary

Considered safe for topical use with low irritation and comedogenic risk. Patch test if you have soy or persimmon allergies. No major safety concerns reported.

Research notes

Research is emerging, with in vitro studies showing antioxidant and anti-inflammatory activity. Human studies are limited, so efficacy claims should be viewed cautiously.

Common label clues

Typical concentration
1–5% in leave-on products
Regulatory status
Generally recognized as safe for cosmetic use in the US and EU when used as directed. Not a drug ingredient.
Common uses
Serums, Moisturizers, Toner, Essence
Environmental note
Soy and persimmon are renewable plant sources, but the fermentation process requires energy and water. Look for brands that source sustainably.

Good to know

  • Fermentation can make plant compounds more bioavailable for skin, but it also means the ingredient may have a slight natural scent.
  • This ingredient is often found in K-beauty products that emphasize fermentation technology.

Common questions

What is Fermented Persimmon & Soybean Extract in beauty products?

This ingredient is made by fermenting persimmon leaves and soybeans with a type of friendly bacteria (Bacillus). The fermentation process breaks down the plant materials into smaller, more active compounds that can be easier for skin to use. It's thought to have antioxidant effects (helping protect skin from environmental damage) and soothing benefits, but most of the evidence comes from lab studies, not large human trials.

What does Fermented Persimmon & Soybean Extract do in a beauty product?

The fermentation creates bioactive peptides and antioxidants that can help neutralize free radicals on the skin's surface. It may also support the skin's natural barrier by providing amino acids that help maintain hydration and calm irritation.

Is Fermented Persimmon & Soybean Extract safe for most people?

Considered safe for topical use with low irritation and comedogenic risk. Patch test if you have soy or persimmon allergies. No major safety concerns reported.

Who should be careful with Fermented Persimmon & Soybean Extract?

Anyone with a known allergy to soy or persimmon should patch test first

Research sources

CosIng - European Commission ingredient databaseOpenPubMed - Antioxidant activity of fermented persimmon leaf extractOpenINCIDecoder - Ingredient profileOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.