Ingredient review

Alteromonas Ferment Filtrate

INCI: Alteromonas Ferment Filtrate

A gentle, hydrating ingredient from marine bacteria that supports skin moisture and resilience.

beautyskincarehumectant

In plain English

Alteromonas Ferment Filtrate is made by fermenting a type of bacteria found in deep ocean waters. The resulting liquid contains sugars and amino acids that help your skin hold onto moisture and stay calm. It's like a soothing drink for your skin, without any heavy or greasy feel.

Quick decision guide

Useful, but context matters

Alteromonas Ferment Filtrate 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Alteromonas Ferment Filtrate.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A fermented filtrate derived from Alteromonas bacteria, a microorganism sourced from deep-sea hydrothermal vents. The fermentation process produces a complex broth rich in polysaccharides, amino acids, and minerals.

How it works

When applied to the skin, the polysaccharides in the filtrate form a thin, invisible film that helps reduce water loss (transepidermal water loss, or TEWL). It also provides amino acids that support the skin's natural moisture barrier and may help calm irritation.

Pros

Deep-sea hydration

Derived from bacteria that thrive in extreme ocean environments, the filtrate provides unique polysaccharides that help skin retain moisture effectively.

Gentle on skin

With a low irritation and comedogenic risk, it's suitable for most skin types, including sensitive and acne-prone skin.

Cons and cautions

Limited research

While promising, the evidence for Alteromonas Ferment Filtrate is not as extensive as for classic humectants like glycerin or hyaluronic acid.

Higher cost

The biotech fermentation process makes this ingredient more expensive, which can increase the price of products containing it.

Best for

  • People with dry or dehydrated skin looking for extra hydration
  • Those with sensitive skin who want a gentle, non-irritating moisturizing ingredient

Use caution if

  • Individuals with a known allergy to marine-derived ingredients (rare)

Usage tips

Apply products with this ingredient to slightly damp skin for better absorption.
Layer with a moisturizer containing occlusives like shea butter or squalane to lock in hydration.

Safety summary

Alteromonas Ferment Filtrate is considered safe for topical use with a low risk of irritation or allergic reactions. It is non-comedogenic and well-tolerated by most skin types.

Research notes

Studies suggest that Alteromonas-derived polysaccharides can improve skin hydration and reduce transepidermal water loss. Most evidence comes from in vitro and small human trials; larger studies are needed to confirm long-term benefits.

Common label clues

Typical concentration
1-5% in leave-on products
Regulatory status
Generally recognized as safe for cosmetic use in the US and EU. No specific restrictions beyond standard cosmetic ingredient regulations.
Common uses
Serums, Moisturizers, Eye Creams
Environmental note
Produced via controlled fermentation, which is more sustainable than harvesting from the ocean. However, the energy-intensive process may have a moderate environmental footprint.

Good to know

  • Alteromonas bacteria are found near deep-sea hydrothermal vents, where they survive extreme pressure and temperature.
  • The ingredient is often used in K-beauty and luxury skincare lines for its soothing and hydrating properties.

Common questions

What is Alteromonas Ferment Filtrate in beauty products?

Alteromonas Ferment Filtrate is made by fermenting a type of bacteria found in deep ocean waters. The resulting liquid contains sugars and amino acids that help your skin hold onto moisture and stay calm. It's like a soothing drink for your skin, without any heavy or greasy feel.

What does Alteromonas Ferment Filtrate do in a beauty product?

When applied to the skin, the polysaccharides in the filtrate form a thin, invisible film that helps reduce water loss (transepidermal water loss, or TEWL). It also provides amino acids that support the skin's natural moisture barrier and may help calm irritation.

Is Alteromonas Ferment Filtrate safe for most people?

Alteromonas Ferment Filtrate is considered safe for topical use with a low risk of irritation or allergic reactions. It is non-comedogenic and well-tolerated by most skin types.

Who should be careful with Alteromonas Ferment Filtrate?

Individuals with a known allergy to marine-derived ingredients (rare)

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Ferment FiltratesOpenPubMed - Marine Polysaccharides in SkincareOpenINCI Database - Alteromonas Ferment FiltrateOpen

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.