Ingredient dictionary

Leuconostoc/Radish Root Ferment Filtrate

A liquid made by fermenting radish root with Leuconostoc bacteria, then filtering out the bacterial cells. It is used mainly to condition and help hydrate skin and hair. It is on the label of 25 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Leuconostoc/Radish Root Ferment Filtrate does

Conditions skin and hair
Helps hydrate skin and hair
Adds water-soluble compounds from fermentation

Radish root is fermented with Leuconostoc, lactic acid bacteria also found on plants and in foods like kimchi. As they work, the bacteria make small compounds in the liquid. The cells and solids are then filtered out, leaving a clear liquid called the filtrate.

Formulators value it for the water-soluble compounds it may contain, such as organic acids and amino acids. These help a product feel soft and hydrated on skin and hair. The liquid blends easily into water-based serums and conditioners, and it often feels light rather than greasy.

Good for

Suits people looking for a gentle hydrating ingredient in serums, conditioners and other leave-on products.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is Leuconostoc/Radish Root Ferment Filtrate safe for skin?

It is generally well tolerated and is used in many skincare and haircare products. As with any ingredient, a person can react to it, so patch testing a new product on a small area first is a sensible habit.

What does Radish Root Ferment Filtrate do in a serum or conditioner?

Its main job is to help hydrate and condition. Formulators add it for the soluble compounds left after fermentation, which help products feel smooth and soft. It works alongside other ingredients, so its effect is part of the whole blend.