Ingredient review

Day Lily Ferment Filtrate

INCI: SACCHAROMYCES/DAY LILY FLOWER FERMENT FILTRATE

A gentle, fermented botanical ingredient that may help calm skin and provide antioxidant support, though research is still emerging.

beautyskincareantioxidant

In plain English

This ingredient is made by fermenting day lily flowers with beneficial yeast (Saccharomyces). Fermentation breaks down the plant material into smaller, potentially more absorbable compounds. In skincare, it's used to help soothe irritation and protect skin from environmental stress, similar to how other fermented ingredients like galactomyces work. Think of it as a gentle, plant-based skin tonic.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

Potentially useful with some tradeoffs

The evidence base is still emerging, so marketing claims deserve extra caution.

Risk flags are low for most users, though the finished product can still irritate.

Source
biotech
Evidence
emerging
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Day Lily 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 Day Lily 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

emerging

The ingredient may be promising, but claims should be treated more cautiously.

What it is

A filtrate obtained from fermenting day lily (Hemerocallis fulva) flowers with Saccharomyces yeast. The fermentation process creates a complex mixture of peptides, amino acids, and antioxidants.

How it works

The fermentation process breaks down the day lily flower's natural compounds into smaller molecules that may be more easily absorbed by the skin. These compounds can help neutralize free radicals (unstable molecules that damage skin) and may support the skin's natural barrier function. The yeast itself also contributes beneficial metabolites like vitamins and amino acids.

Pros

Gentle soothing

May help calm redness and irritation without harsh chemicals, making it suitable for sensitive skin.

Antioxidant support

The fermentation process creates antioxidants that help protect skin from daily environmental damage like pollution and UV stress.

Cons and cautions

Limited research

Most evidence comes from lab studies or general knowledge of fermentation; there are few human clinical trials specifically on day lily ferment.

Potential allergen

As a plant-derived ingredient, it may cause allergic reactions in people sensitive to day lilies or related botanical families.

Best for

  • People with sensitive or easily irritated skin
  • Those looking for gentle antioxidant support
  • Fans of fermented skincare ingredients

Use caution if

  • Individuals with known allergies to day lilies or related plants
  • Those with severe yeast allergies (though risk is low)

Usage tips

Use in a serum or essence after cleansing and before heavier moisturizers for best absorption.
Patch test on a small area of skin before first full use, especially if you have plant allergies.
Store products containing this ingredient in a cool, dark place to preserve the active compounds.

Safety summary

This ingredient has a low irritation and comedogenic risk based on its composition and similarity to other fermented ingredients. However, individual plant allergies are possible. Always patch test.

Research notes

Research on this specific ingredient is limited. Most support comes from studies on general fermentation benefits and the antioxidant properties of day lily extracts. More human studies are needed to confirm specific skincare benefits.

Common label clues

Typical concentration
Typically used at 1-5% in leave-on products
Regulatory status
Generally recognized as safe for cosmetic use in the US and EU when used as intended. Not a drug ingredient.
Common uses
Serums, Toners, Essences, Moisturizers
Environmental note
Day lilies are widely cultivated and not considered endangered. The fermentation process is relatively low-impact compared to synthetic chemical production.

Good to know

  • Fermented ingredients are popular in K-beauty for their gentle, multi-functional benefits.
  • Day lily flowers are different from true lilies (Lilium) and are generally considered safe in cosmetics.
  • The fermentation process can enhance the skin's ability to absorb beneficial compounds.

Common questions

What is Day Lily Ferment Filtrate in beauty products?

This ingredient is made by fermenting day lily flowers with beneficial yeast (Saccharomyces). Fermentation breaks down the plant material into smaller, potentially more absorbable compounds. In skincare, it's used to help soothe irritation and protect skin from environmental stress, similar to how other fermented ingredients like galactomyces work. Think of it as a gentle, plant-based skin tonic.

What does Day Lily Ferment Filtrate do in a beauty product?

The fermentation process breaks down the day lily flower's natural compounds into smaller molecules that may be more easily absorbed by the skin. These compounds can help neutralize free radicals (unstable molecules that damage skin) and may support the skin's natural barrier function. The yeast itself also contributes beneficial metabolites like vitamins and amino acids.

Is Day Lily Ferment Filtrate safe for most people?

This ingredient has a low irritation and comedogenic risk based on its composition and similarity to other fermented ingredients. However, individual plant allergies are possible. Always patch test.

Who should be careful with Day Lily Ferment Filtrate?

Individuals with known allergies to day lilies or related plants Those with severe yeast allergies (though risk is low)

Research sources

INCI Database - Saccharomyces/Day Lily Flower Ferment FiltrateOpenPubMed - Antioxidant activity of day lily extractsOpenCosmetic Ingredient Review - Safety of Ferment FiltratesOpen

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.