What Is Lactobacillus/Perilla Frutescens Leaf Ferment Filtrate?
Lactobacillus/Perilla Frutescens Leaf Ferment Filtrate comes from the green aromatic leaves of Perilla frutescens, also called shiso, that are placed in a water base with the probiotic microorganism Lactobacillus. During fermentation the bacteria break down plant proteins and starches into smaller molecules like peptides, amino acids, sugars and organic acids, while freeing up polyphenols already present in the leaf. The finished liquid is then carefully filtered to remove solids and microbes, yielding a clear silky filtrate used in skin care.
Fermented botanicals rose to fame in Korean and Japanese beauty routines where consumers value gentle yet effective formulas. Brands soon noticed that fermentation can increase the bioavailability of plant nutrients and create a naturally balanced pH, making these ingredients attractive for modern cosmetic labs.
The process starts with harvested perilla leaves that are washed and sometimes steamed to reduce surface microbes. The leaves steep in a controlled vessel with Lactobacillus and a small amount of carbohydrate to feed the culture. Temperature and time are monitored until the desired acidity and nutrient profile are reached, usually within a few days. Afterward the mixture is filtered, preserved and standardized for consistent quality.
You will typically find Lactobacillus/Perilla Frutescens Leaf Ferment Filtrate in hydrating toners, watery essences, sheet masks, barrier-support serums, calming moisturizers, lightweight anti-aging creams, after-sun gels and even scalp soothing sprays where it adds a gentle conditioning touch.
Lactobacillus/Perilla Frutescens Leaf Ferment Filtrate’s Cosmetic Benefits/Uses
This ingredient is valued mainly for its skin conditioning ability. By delivering small peptides, amino acids and sugars it helps skin hold onto moisture, leaves the surface softer and supports a smooth even feel. The natural organic acids contribute to a balanced pH that can enhance product mildness while the liberated polyphenols supply antioxidant support, which together promote a healthier looking complexion.
Who Can Use Lactobacillus/Perilla Frutescens Leaf Ferment Filtrate
This ferment filtrate is gentle enough for nearly every skin type. Dry or mature skin benefits from the added moisture binding amino acids while oily and acne prone complexions appreciate its weightless water like texture that will not clog pores. Sensitive or redness prone skin tends to tolerate it well thanks to its naturally balanced pH and calming polyphenols. There are no known reasons to avoid it for specific skin types unless you have a confirmed allergy to perilla or other herbs from the mint family, in which case you should steer clear.
The ingredient is vegan and vegetarian friendly because it is produced solely from plant leaves and probiotic bacteria with no animal derived substances involved in the process. This status can change if the finished cosmetic formula contains other non-vegan additives, so label reading is still important.
Topical use during pregnancy or while breastfeeding is generally considered low risk because the filtrate sits on the skin surface and is not known to penetrate in amounts that could affect the body. This is not medical advice and anyone who is pregnant or nursing should show the full ingredient list of any product to a qualified healthcare provider before use to be extra safe.
The filtrate does not cause photosensitivity and can be used morning or night alongside sunscreen as desired. It layers well with most common actives such as niacinamide, hyaluronic acid, vitamin C or gentle exfoliating acids.
Potential Side Effects/Adverse Reactions
Responses to topical Lactobacillus/Perilla Frutescens Leaf Ferment Filtrate vary from person to person. The following is a list of potential side effects that could occur, though they are uncommon when the ingredient is formulated and preserved correctly and most users will not notice any problems.
- Allergic contact dermatitis in individuals sensitive to perilla or related herbs
- Mild stinging or redness on very reactive skin
- Transient tingling if applied to freshly exfoliated or broken skin
- Rare bacterial contamination issues if a DIY or improperly preserved product is used
If you experience any persistent discomfort swelling or rash while using this ingredient discontinue use immediately and consult a healthcare professional.
Comedogenic Rating
Rating: 0 (non-comedogenic)
Lactobacillus/Perilla Frutescens Leaf Ferment Filtrate is a watery ferment with no heavy oils or waxes so it does not block pores or trap sebum. The molecules created during fermentation are small water-loving compounds like amino acids sugars and organic acids that sit lightly on the skin and quickly absorb. Because it lacks the oily components that usually cause congestion the risk of new blackheads or pimples is extremely low.
That makes this ingredient a good choice for people who are prone to acne or frequent breakouts.
The only pore-related issue that could arise would be if the filtrate is blended into a formula that also contains richer occlusives. In that case the overall product, not the ferment itself, could influence comedogenicity.
Summary
Lactobacillus/Perilla Frutescens Leaf Ferment Filtrate conditions skin by delivering moisture binding amino acids, calming polyphenols and gentle organic acids that help keep the surface smooth and comfortable. The fermenting step increases the availability of these nutrients and naturally balances pH which boosts overall skin friendliness.
Although not as famous as green tea or centella, this ferment is gaining traction in K-beauty inspired toners essences and lightweight creams because users appreciate its soothing non-greasy feel.
It is considered very safe for topical use with a low risk of irritation or pore clogging. As with any new cosmetic ingredient it is smart to do a quick patch test when trying a product that features this ferment just to be sure your skin agrees with it.