Lactobacillus/Collagen/Soymilk Ferment Filtrate: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: July 1, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Lactobacillus/Collagen/Soymilk Ferment Filtrate?

Lactobacillus/Collagen/Soymilk Ferment Filtrate is a skincare ingredient created when collagen and soymilk are fermented by the probiotic bacterium Lactobacillus. During fermentation the proteins, sugars and lipids in the raw materials break down into smaller molecules such as peptides, amino acids and simple carbohydrates, making them easier for skin to absorb. The finished filtrate is then separated out, purified and added to cosmetic formulas.

The idea of using fermented ingredients in beauty products gained traction from traditional Asian skincare which values fermentation for its skin friendly nutrients. As interest in probiotic and fermented cosmetics grew, formulators began combining animal sourced collagen with plant based soymilk to offer a balanced mix of proteins and phyto compounds. Adding Lactobacillus into the process helps create a stable filtrate with skin soothing properties.

You will usually find Lactobacillus/Collagen/Soymilk Ferment Filtrate in hydrating sheet masks, anti aging serums, lightweight moisturizers, overnight creams, soothing after sun gels and leave on treatments that target rough or dull skin.

Lactobacillus/Collagen/Soymilk Ferment Filtrate’s Cosmetic Benefits/Uses

This multitasking filtrate supports healthy looking skin in several ways. In formulas it serves the following roles:

  • Skin conditioning: The blend of fermented peptides and sugars helps soften skin, smooth uneven texture and support a plump appearance which can make fine lines look less obvious.
  • Emollient: The ingredient leaves a light film on the surface that reduces water loss and imparts a silky feel without heaviness making it suitable for both dry and combination skin types.

Who Can Use Lactobacillus/Collagen/Soymilk Ferment Filtrate

This ferment filtrate is generally suitable for normal, dry, combination and even mildly sensitive skin because it is lightweight and soothing. Oily or very acne prone skin can usually tolerate it too, but those who react to richer emollients should watch how their skin responds since the ingredient leaves a soft film that might feel too nourishing for some.

Because the collagen used in the fermentation typically comes from animal sources, the final filtrate is not considered vegan. Vegetarians who avoid animal derived ingredients for ethical reasons may also prefer to skip it and look for a plant based alternative.

Pregnant or breastfeeding women are not known to have any special restrictions with topical use of this ingredient. Still, this is not medical advice and anyone who is expecting or nursing should run new skincare products past a doctor just to be safe.

The ferment filtrate does not increase photosensitivity so it will not make skin more prone to sunburn. Regular daytime sun protection is still recommended for overall skin health.

Potential Side Effects/Adverse Reactions

Side effects and reactions to the topical application of Lactobacillus/Collagen/Soymilk Ferment Filtrate can vary from person to person. The points below list potential issues that could appear in rare cases. Assuming the ingredient has been formulated correctly most users will not experience any negative effects.

  • Skin irritation a stinging or burning sensation, especially on compromised or very sensitive skin
  • Redness or flushing temporary warmth or blotchiness after application
  • Allergic reaction itching, hives or swelling in individuals allergic to soy proteins or animal collagen
  • Breakouts clogged pores or small pimples in people who are highly prone to acne and react to richer leave on films

If any uncomfortable reaction occurs, stop using the product and consult a healthcare professional or dermatologist for tailored advice.

Comedogenic Rating

Rating: 1/5

The filtrate is rich in water soluble peptides, amino acids and simple sugars that do not tend to block pores. While it leaves a thin moisturizing film, it lacks heavy oils or waxes that normally trigger congestion, so the chance of pore clogging is low.

Mild to moderate acne-prone users usually tolerate it well, though those who break out from any film forming ingredients should keep an eye on how their skin responds.

Remember that overall pore friendliness depends on the entire formula, so if the product also contains richer oils or butters the risk can rise even though the ferment itself scores low.

Summary

Lactobacillus/Collagen/Soymilk Ferment Filtrate acts as a skin conditioner and light emollient by supplying broken down peptides and sugars that draw moisture, smooth texture and form a soft protective layer that slows water loss.

It is not a household name yet but has a growing following in K-beauty style masks, serums and creams for people seeking gentle fermented actives and probiotic inspired care.

Topical use is viewed as safe with rare reports of irritation or allergy. Patch test any new product containing this ingredient to make sure your skin agrees with it.

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