What Is Rhizopus/Soybean Ferment Extract Filtrate?
Rhizopus/Soybean Ferment Extract Filtrate is a skin-loving ingredient that begins its journey with humble soybeans. These beans are inoculated with the naturally occurring microorganism Rhizopus, which ferments the soy over a controlled period. Once fermentation is complete, the mixture is filtered to separate solids from liquid, leaving behind a clear filtrate rich in amino acids, peptides, vitamins and enzymes produced during fermentation. This bioactive cocktail is valued for its ability to hydrate and soften skin while supporting a healthy skin barrier.
Traditional Asian skincare has long embraced fermented ingredients for their smoothing and rejuvenating effects. As interest in gentle, plant-based actives has grown, cosmetic chemists began exploring soybean ferment for modern formulas, eventually refining it into the filtrate used today. You will commonly find Rhizopus/Soybean Ferment Extract Filtrate in lightweight moisturizers, sheet masks, essence lotions, anti-aging serums and soothing after-sun treatments where a boost of gentle hydration and barrier support is desired.
Rhizopus/Soybean Ferment Extract Filtrate’s Cosmetic Benefits/Uses
This ingredient is prized for one primary function within skincare formulas.
Rhizopus/Soybean Ferment Extract Filtrate acts as a skin-conditioning agent, meaning it helps maintain the skin’s softness, smoothness and overall healthy appearance. By delivering naturally derived peptides and humectants, it attracts moisture to the surface, reinforces the skin barrier and leaves the complexion feeling supple and comfortable without a heavy or greasy after-feel.
Who Can Use Rhizopus/Soybean Ferment Extract Filtrate
This ingredient is generally well tolerated by most skin types, including dry, oily, combination and sensitive, thanks to its lightweight water based profile and barrier supporting properties. The only group that should steer clear is anyone with a known soy allergy, since trace soy proteins can remain after fermentation and could trigger a reaction.
Because the filtrate is derived entirely from soybeans and the fermentation process involves no animal products, it suits both vegans and vegetarians. Most formulations containing it are also free of common animal derived additives, making it an easy choice for shoppers looking to keep their routines plant based.
Current research and cosmetic safety assessments indicate no specific concerns for pregnant or breastfeeding individuals, but this is not medical advice. Anyone who is expecting or nursing should discuss new skincare products with a healthcare professional before use just to be certain the product fits their personal needs.
Rhizopus/Soybean Ferment Extract Filtrate does not make skin more prone to sunburn and can be used morning and night without extra photosensitivity precautions. It layers well with other actives and does not interfere with makeup or sunscreen.
Potential Side Effects/Adverse Reactions
Responses to topical Rhizopus/Soybean Ferment Extract Filtrate vary from person to person. The effects listed below are possible but uncommon when the ingredient is formulated and used correctly.
- Allergic reaction in individuals sensitive to soy — may present as hives, swelling or itching
- Mild irritation or redness — usually temporary and more likely if the product contains additional strong actives or fragrance
- Contact dermatitis — rare but possible in highly reactive skin that struggles with many fermented ingredients
If you experience any of these effects, discontinue use and seek medical advice if symptoms persist or worsen.
Comedogenic Rating
Rating: 1/5 (very low chance of clogging pores). This filtrate is water based and lightweight, containing mainly small peptides, amino acids and humectants rather than heavy oils or waxes. It sinks in quickly, leaves no greasy film and is usually used at low levels, making its pore-clogging potential minimal.
Generally suitable for acne prone skin.
The overall formula still matters: if the product also contains rich butters or thick silicones the comedogenic risk can rise even though the ferment itself is low.
Summary
Rhizopus/Soybean Ferment Extract Filtrate conditions skin by supplying fermented peptides, amino acids and humectants that draw in moisture and strengthen the barrier, leaving skin softer, smoother and better hydrated.
It is not yet as famous as hyaluronic acid or niacinamide but its popularity is growing in essences, sheet masks and clean beauty lines that favor gentle fermented ingredients.
Safety profiles show it is well tolerated for most users except those with soy allergies. As always perform a quick patch test when introducing any new product that contains it to ensure your skin agrees.