What Is Lactobacillus/Defatted Soybean Seed Extract Ferment Filtrate?
Lactobacillus/Defatted Soybean Seed Extract Ferment Filtrate is a bio-processed ingredient that starts with defatted soybean seeds, the part left once most of the oil has been removed. These seeds are rich in proteins, peptides and sugars. They are soaked to draw out the water-soluble compounds, then that extract is inoculated with Lactobacillus, the same friendly bacteria often used to make yogurt. While the bacteria feed on the soybean nutrients they break large molecules into smaller skin-loving components such as amino acids, short peptides and moisturising saccharides. After fermentation the mix is filtered, leaving behind a clear liquid known as the filtrate.
Fermented botanicals first gained attention in Korean beauty labs in the early 2000s, where scientists noticed that microbial breakdown boosted the antioxidant and soothing profile of plant extracts. This soybean-based filtrate followed soon after as a gentle, plant-derived alternative to harsher synthetic actives.
The ingredient is produced in controlled vats to guarantee purity, then stabilised and added to formulations at low percentages. You are likely to find it in hydrating sheet masks, lightweight serums aimed at redness relief, daily moisturisers targeting a smoother skin barrier and occasional leave-on treatments designed for post-exfoliation comfort.
Lactobacillus/Defatted Soybean Seed Extract Ferment Filtrate’s Cosmetic Benefits/Uses
The primary role of this fermented soybean filtrate in skincare is skin conditioning, which means it helps keep the surface of your skin feeling soft, balanced and healthy. It supplies small molecules that attract water, lending lightweight hydration without a greasy feel. At the same time naturally occurring peptides can support a stronger moisture barrier, leading to smoother texture and a calmer look over time.
Who Can Use Lactobacillus/Defatted Soybean Seed Extract Ferment Filtrate
This fermented soybean filtrate is generally suitable for all skin types. Normal and dry complexions appreciate its lightweight hydration while oily and combination skin benefit from the non-greasy finish. Sensitive skin often tolerates it well thanks to the soothing by-products of fermentation, although anyone with a known soy allergy should avoid it because the base material is still soybean derived.
The ingredient is derived from plants and produced with the help of a food-grade bacterium, so it contains no animal derivatives and is considered appropriate for vegans and vegetarians.
Pregnant or breastfeeding individuals are not known to face special risks from topical use of this ferment, yet this is not medical advice. Out of caution it is best for expectant or nursing mothers to review any skincare product with their healthcare provider before use.
Lactobacillus/Defatted Soybean Seed Extract Ferment Filtrate does not increase photosensitivity, meaning it will not make skin more prone to sunburn. Standard daytime sun protection is still recommended for overall skin health.
Potential Side Effects/Adverse Reactions
Responses to topical Lactobacillus/Defatted Soybean Seed Extract Ferment Filtrate vary from person to person. The effects listed below are possible yet uncommon when the ingredient is properly formulated and used as directed.
- Allergic reaction in individuals sensitive to soy proteins
- Localized redness or stinging on very reactive skin
- Mild itching or rash linked to individual intolerance of fermentation by-products
- Rare cases of clogged pores if combined with highly occlusive formulas
If you notice any of these effects stop using the product immediately and seek guidance from a qualified healthcare professional.
Comedogenic Rating
Rating: 1 / 5
Lactobacillus/Defatted Soybean Seed Extract Ferment Filtrate is water based and light in texture with no oily residues, so it rarely traps debris inside pores. Its small size peptides and sugars attract moisture rather than forming heavy films, which keeps pore blockage risk low. Because the raw soybean component is defatted, virtually all comedogenic lipids have been removed, further reducing the likelihood of breakouts.
Suitable for acne-prone or breakout-prone skin in most cases.
Formulas that mix this ferment with rich butters or high percentages of waxes could still cause congestion, so the overall product, not just this single ingredient, determines final pore-clogging potential.
Summary
Lactobacillus/Defatted Soybean Seed Extract Ferment Filtrate is a fermented soybean liquid that conditions skin by providing lightweight hydration, barrier-supporting peptides and calming fermented by-products. During fermentation Lactobacillus breaks large soybean proteins into smaller molecules that penetrate more easily and draw water to the upper layers, leaving skin softer and more comfortable.
While not a headline ingredient like vitamin C or retinol, it has carved a niche in Korean beauty inspired formulas and gentle barrier-care products thanks to its mild nature and plant origin. Brands seeking vegan friendly soothing actives often turn to this ferment for an extra touch of softness.
Topical use is considered very safe for the general public with soy-allergic individuals being the main group that should steer clear. As with any new skincare addition it is wise to perform a quick patch test on a small area before applying broadly to confirm personal tolerance.