Ingredient review

Auxenochlorella Protothecoides Lysate Filtrate

INCI: Auxenochlorella Protothecoides Lysate Filtrate

A gentle, algae-derived ingredient that helps hydrate and support the skin barrier without irritation.

beautyskincarehumectant

In plain English

This ingredient comes from a type of microalgae grown in a lab. The algae cells are broken open (lysed) and then filtered to create a liquid rich in amino acids, peptides, and sugars. When applied to skin, it helps attract moisture and supports the skin's natural protective barrier. It's a modern, sustainable alternative to traditional plant extracts.

Quick decision guide

Useful, but context matters

Auxenochlorella Protothecoides Lysate 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 Auxenochlorella Protothecoides Lysate 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

Auxenochlorella protothecoides is a single-celled green microalgae. The lysate filtrate is produced by fermenting the algae, then breaking the cells open and filtering out the solids. The resulting liquid contains water-soluble nutrients like amino acids, peptides, and polysaccharides.

How it works

The amino acids and sugars in the filtrate act as humectants, drawing water into the outer layer of skin. Peptides may signal skin cells to produce more natural moisturizing factors and support the skin barrier. The ingredient is also thought to have mild antioxidant properties, helping protect skin from environmental stress.

Pros

Gentle hydration

Provides moisture without irritation, making it suitable for sensitive skin types.

Sustainable sourcing

Produced from lab-grown microalgae, reducing environmental impact compared to wild-harvested botanicals.

Cons and cautions

Moderate evidence

Most research is on the algae itself or in vitro; fewer large-scale human trials confirm its benefits.

Lower potency

May not deliver as dramatic a hydration boost as higher-concentration humectants like hyaluronic acid.

Best for

  • People with dry or dehydrated skin
  • Those looking for a gentle, plant-based hydrating ingredient

Use caution if

  • Individuals with known algae allergies (rare)

Usage tips

Look for this ingredient in serums or moisturizers where it can be combined with other humectants for layered hydration.
Store products containing this ingredient in a cool, dark place to preserve stability.

Safety summary

Considered safe for topical use with a very low risk of irritation or allergic reaction. No known toxicity concerns at typical cosmetic concentrations.

Research notes

In vitro and some small human studies suggest hydrating and barrier-supporting effects. More large-scale clinical trials 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.
Common uses
Serums, Moisturizers, Eye creams
Environmental note
Produced via controlled fermentation, this ingredient has a lower environmental footprint than many land-based plant extracts.

Good to know

  • This ingredient is often listed near the middle or end of an ingredient list, indicating a moderate concentration.
  • It is a byproduct of the algae fermentation process, similar to how some skincare ingredients are derived from yeast.

Common questions

What is Auxenochlorella Protothecoides Lysate Filtrate in beauty products?

This ingredient comes from a type of microalgae grown in a lab. The algae cells are broken open (lysed) and then filtered to create a liquid rich in amino acids, peptides, and sugars. When applied to skin, it helps attract moisture and supports the skin's natural protective barrier. It's a modern, sustainable alternative to traditional plant extracts.

What does Auxenochlorella Protothecoides Lysate Filtrate do in a beauty product?

The amino acids and sugars in the filtrate act as humectants, drawing water into the outer layer of skin. Peptides may signal skin cells to produce more natural moisturizing factors and support the skin barrier. The ingredient is also thought to have mild antioxidant properties, helping protect skin from environmental stress.

Is Auxenochlorella Protothecoides Lysate Filtrate safe for most people?

Considered safe for topical use with a very low risk of irritation or allergic reaction. No known toxicity concerns at typical cosmetic concentrations.

Who should be careful with Auxenochlorella Protothecoides Lysate Filtrate?

Individuals with known algae allergies (rare)

Research sources

Cosmetic Ingredient Review (CIR) - Algae IngredientsOpenPubMed - Microalgae in CosmeticsOpenINCI Database - Auxenochlorella Protothecoides Lysate 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.