Ingredient review
Fermented Longan & Soybean Complex
INCI: BACILLUS/DIMOCARPUS LONGAN FRUIT/SOYBEAN FERMENT FILTRATE
A gentle, fermented botanical complex that may help protect skin from environmental stress and improve hydration, though human research is still limited.
In plain English
This ingredient is made by fermenting longan fruit and soybeans with a type of friendly bacteria (Bacillus). The fermentation process breaks down the plant materials into smaller, more easily absorbed compounds. In skincare, it's used as an antioxidant to help defend skin from pollution and UV damage, and as a skin conditioner to keep the surface feeling smooth and hydrated. Think of it as a nutrient-rich broth for your skin.
Quick decision guide
Useful, but context matters
Fermented Longan & Soybean Complex 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Fermented Longan & Soybean Complex.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A filtrate obtained after fermenting Dimocarpus longan fruit (longan) and soybean (Glycine max) with Bacillus bacteria. The fermentation creates a mixture of peptides, amino acids, sugars, and antioxidant compounds.
How it works
The fermentation process generates bioactive molecules that can scavenge free radicals (unstable molecules that damage skin cells) and support the skin's natural moisture barrier. The small peptide and amino acid fragments may also help condition the skin, leaving it feeling softer and more supple.
Pros
Gentle antioxidant
Provides antioxidant benefits without the irritation sometimes seen with stronger antioxidants like pure vitamin C, making it suitable for sensitive skin.
Hydration support
The fermentation process creates small molecules that may help attract and retain moisture in the skin, improving overall hydration levels.
Cons and cautions
Limited research
Most evidence comes from lab studies or ingredient supplier data, not large-scale human trials, so the real-world effectiveness is not fully proven.
Potential allergen
Because it contains soybean derivatives, people with soy allergies should patch test or avoid this ingredient to prevent a reaction.
Best for
- People looking for antioxidant protection in a gentle, non-irritating form
- Those interested in probiotic or fermented skincare ingredients
Use caution if
- Individuals with known allergies to soy or longan fruit
- Anyone with a history of severe allergic reactions to fermented ingredients
Usage tips
Safety summary
This ingredient is considered safe for topical use in cosmetics. The fermentation process is controlled to prevent contamination. As with any new ingredient, patch testing is recommended for those with sensitive skin or soy allergies.
Research notes
Research on this specific ferment filtrate is limited. Studies on similar fermented botanical ingredients suggest potential antioxidant and moisturizing benefits, but more human clinical trials are needed to confirm efficacy.
Common label clues
- Typical concentration
- 1% to 10% in leave-on products
- 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, Moisturizers, Essences, Face masks
- Environmental note
- Soybean farming can have environmental impacts, but fermentation is a relatively low-energy process. Look for brands that source soybeans sustainably if this is a concern.
Good to know
- Fermented ingredients are often marketed as 'probiotic' skincare, but they do not contain live bacteria—only the beneficial byproducts of fermentation.
- The longan fruit used in this ferment is rich in vitamin C and polyphenols, which may contribute to its antioxidant activity.
Common questions
What is Fermented Longan & Soybean Complex in beauty products?
This ingredient is made by fermenting longan fruit and soybeans with a type of friendly bacteria (Bacillus). The fermentation process breaks down the plant materials into smaller, more easily absorbed compounds. In skincare, it's used as an antioxidant to help defend skin from pollution and UV damage, and as a skin conditioner to keep the surface feeling smooth and hydrated. Think of it as a nutrient-rich broth for your skin.
What does Fermented Longan & Soybean Complex do in a beauty product?
The fermentation process generates bioactive molecules that can scavenge free radicals (unstable molecules that damage skin cells) and support the skin's natural moisture barrier. The small peptide and amino acid fragments may also help condition the skin, leaving it feeling softer and more supple.
Is Fermented Longan & Soybean Complex safe for most people?
This ingredient is considered safe for topical use in cosmetics. The fermentation process is controlled to prevent contamination. As with any new ingredient, patch testing is recommended for those with sensitive skin or soy allergies.
Who should be careful with Fermented Longan & Soybean Complex?
Individuals with known allergies to soy or longan fruit Anyone with a history of severe allergic reactions to fermented ingredients
Research sources
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.