What Is Streptococcus Thermophilus Ferment Extract Filtrate?
Streptococcus Thermophilus Ferment Extract Filtrate comes from the friendly bacterium Streptococcus thermophilus, the same species often used to make yogurt. In the lab this microbe is placed in a controlled broth where it breaks down sugars and proteins during fermentation. The liquid left after fermentation is rich in helpful lipids, proteins and sugars. It is then filtered to remove the bacteria, leaving a clear, stable fluid suitable for skin care.
The skin care world grew interested in this filtrate after studies on fermented ingredients showed they could soften skin and support its barrier. Brands first added it to high-end moisturizers in the early 2000s, and today it is found in a range of formulas. You will see it in nourishing creams, overnight masks, soothing serums, anti-aging lotions and even gentle cleansers, where it helps give a smooth after-feel.
Streptococcus Thermophilus Ferment Extract Filtrate’s Cosmetic Benefits/Uses
The main job of this ingredient is to act as an emollient. As an emollient it glides over the surface of the skin and fills in tiny gaps between skin cells. This smooths rough patches, reduces flaking and leaves a soft, silky finish. Its lipid content also helps keep water from escaping, so skin feels hydrated longer and looks more supple.
Who Can Use Streptococcus Thermophilus Ferment Extract Filtrate
This ferment filtrate is gentle and works for almost every skin type. Dry and mature skin benefit most because the emollient lipids lock in moisture and soften rough spots. Sensitive skin usually tolerates it well since it lacks harsh acids or fragrances. Oily or combination skin can also use it, as the ingredient is lightweight and does not leave a greasy film. Only people with a very rare allergy to dairy-related proteins might need extra caution because the source microbe is tied to yogurt production, though the final filtrate typically contains no milk proteins.
The ingredient is produced through bacterial fermentation, so it is not taken from animals. That makes it suitable for vegetarians and vegans, provided the finished formula has no other animal-derived additives.
No studies suggest problems for pregnant or breastfeeding women when the ingredient is applied to skin. Still this is not medical advice. Anyone who is pregnant or nursing should show the product to a healthcare professional before adding it to a routine, just to be safe.
Streptococcus Thermophilus Ferment Extract Filtrate does not increase photosensitivity, so it will not make skin more prone to sunburn. Normal daytime sun protection is still advised with any skin care routine.
Potential Side Effects/Adverse Reactions
Reactions to topical Streptococcus Thermophilus Ferment Extract Filtrate differ from person to person. The points below list potential side effects, but most users experience none of these when the ingredient is formulated and used correctly.
- Mild redness or stinging in very sensitive skin during first uses
- Itching or small bumps in those with a specific allergy to ferment-based ingredients
- Contact dermatitis if the product also contains another sensitizing agent and the two interact
- Temporary breakouts in acne-prone skin if the full product contains occlusive oils alongside the filtrate
If any irritation or other unwanted effect occurs stop using the product and consult a healthcare professional.
Comedogenic Rating
Rating: 1 out of 5. This filtrate is mostly water with small amounts of skin-friendly lipids and peptides, so it is unlikely to clog pores. The molecules are lightweight and tend to sit on the surface rather than sinking into follicles. Because of this low rating the ingredient is generally suitable for people prone to acne or breakouts. As with any component, the overall formula matters, so very occlusive creams may still pose a risk even if this ferment itself is non-problematic.
Summary
Streptococcus Thermophilus Ferment Extract Filtrate acts mainly as an emollient, gliding over skin to fill microscopic gaps, soften rough areas and reinforce the moisture barrier. Its blend of lipids, proteins and sugars helps reduce transepidermal water loss which keeps skin feeling supple and smooth.
The ingredient is still a bit of an insider pick rather than a household name, but interest is climbing as more brands lean into fermented actives for gentle skin barrier support.
Most users tolerate it well, with low risk of irritation or pore clogging, so it is considered safe for regular use. As with any new product it is smart to perform a quick patch test to confirm personal compatibility before applying it to the entire face.