Ingredient review

Fermented Rice & Soy Milk Filtrate

INCI: ASPERGILLUS/RICE/SOYMILK FERMENT FILTRATE

A gentle fermented ingredient that helps soften and smooth skin without harsh scrubbing, ideal for those who want mild exfoliation.

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In plain English

This ingredient is made by letting a friendly fungus (Aspergillus) ferment a mixture of rice and soymilk. The fermentation process breaks down proteins and starches into smaller, skin-friendly molecules like amino acids and peptides. When applied to skin, it can gently loosen dead skin cells and improve texture, similar to a mild acid but much less irritating. It also provides hydration and may help strengthen the skin barrier.

Quick decision guide

Useful, but context matters

Fermented Rice & Soy Milk Filtrate 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 Rice & Soy Milk Filtrate.
  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

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A fermented filtrate produced by culturing Aspergillus fungus on a substrate of rice and soymilk. After fermentation, the liquid is filtered to remove solids, leaving a solution rich in amino acids, peptides, organic acids, and enzymes.

How it works

The fermentation process creates natural enzymes and mild organic acids that gently exfoliate the outermost layer of dead skin cells. The resulting amino acids and peptides also act as humectants, drawing moisture into the skin and supporting a healthy barrier function.

Pros

Gentle exfoliation

Unlike harsh scrubs or strong acids, this ferment uses natural enzymes to loosen dead skin cells, making it safe for daily use even on sensitive skin.

Hydrating bonus

The amino acids and peptides left behind after fermentation help attract and hold moisture in the skin, so you get both exfoliation and hydration in one step.

Cons and cautions

Mild effect

If you have thick, rough, or acne-prone skin that needs strong exfoliation, this ingredient may not deliver the dramatic results you're looking for.

Allergen potential

Because it's derived from soy and a fungus, people with soy allergies or mold sensitivities should patch test carefully before using.

Best for

  • People with dry or sensitive skin who want mild exfoliation
  • Those looking for a multi-tasking ingredient that hydrates while gently smoothing skin

Use caution if

  • Individuals with a known allergy or sensitivity to Aspergillus or fermented soy products

Usage tips

Use in a toner or essence after cleansing to allow the enzymes to work on clean skin.
Follow with a moisturizer to lock in the hydration from the amino acids.
If you're new to fermented ingredients, start with a low-concentration product and use it every other day.

Safety summary

This ingredient is considered safe for topical use in cosmetics. The fermentation process breaks down potential allergens, but individuals with soy or mold allergies should patch test. No significant safety concerns have been reported in the scientific literature.

Research notes

Research on Aspergillus-based ferments in skincare is limited but growing. Studies on similar fermented ingredients (e.g., galactomyces ferment filtrate) show benefits for skin hydration and barrier function. The specific combination of rice and soymilk fermented with Aspergillus has anecdotal support in cosmetic formulations but lacks large-scale clinical trials.

Common label clues

Typical concentration
Usually 1–10% in leave-on products, but can be higher in rinse-off formulas
Regulatory status
Generally recognized as safe for cosmetic use in the US and EU when used as directed. No specific restrictions beyond standard cosmetic ingredient regulations.
Common uses
Serums, Toners, Essences, Moisturizers
Environmental note
The fermentation process is relatively low-energy and uses agricultural byproducts (rice, soymilk), making it a more sustainable option compared to some synthetic exfoliants.

Good to know

  • Fermented ingredients like this one are popular in K-beauty for their gentle, multi-benefit approach.
  • The fermentation process can also reduce the potential for irritation compared to using raw rice or soy extracts.

Common questions

What is Fermented Rice & Soy Milk Filtrate in beauty products?

This ingredient is made by letting a friendly fungus (Aspergillus) ferment a mixture of rice and soymilk. The fermentation process breaks down proteins and starches into smaller, skin-friendly molecules like amino acids and peptides. When applied to skin, it can gently loosen dead skin cells and improve texture, similar to a mild acid but much less irritating. It also provides hydration and may help strengthen the skin barrier.

What does Fermented Rice & Soy Milk Filtrate do in a beauty product?

The fermentation process creates natural enzymes and mild organic acids that gently exfoliate the outermost layer of dead skin cells. The resulting amino acids and peptides also act as humectants, drawing moisture into the skin and supporting a healthy barrier function.

Is Fermented Rice & Soy Milk Filtrate safe for most people?

This ingredient is considered safe for topical use in cosmetics. The fermentation process breaks down potential allergens, but individuals with soy or mold allergies should patch test. No significant safety concerns have been reported in the scientific literature.

Who should be careful with Fermented Rice & Soy Milk Filtrate?

Individuals with a known allergy or sensitivity to Aspergillus or fermented soy products

Research sources

Cosmetic Ingredient Review (CIR) - Safety of Fermented IngredientsOpenPubMed - Effects of Fermented Plant Extracts on SkinOpenINCI Database - Aspergillus/Rice/Soymilk Ferment FiltrateOpen

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.