Prebiotic/Probiotic/Postbiotic

Lactobacillus … Ferment Filtrate

INCI: LACTOBACILLUS/GANODERMA LUCIDUM EXTRACT/LENTINUS EDODES EXTRACT FERMENT FILTRATE

Reviewed by Kate · Last updated 14 Aug 2026

A fermented blend of mushroom and probiotic extracts for skin and hair conditioning

Best For Skin Types

All, Dry, Sensitive, Mature

Addresses

Dryness, Hydration, Barrier repair

Usage Frequency

Daily

What Is Lactobacillus … Ferment Filtrate?

This ingredient is a fermentation filtrate combining Lactobacillus (a beneficial bacterium commonly used in skincare), Ganoderma lucidum (reishi mushroom), and Lentinus edodes (shiitake mushroom) extracts. The fermentation process breaks down the mushroom cell walls, creating smaller molecular compounds that can penetrate and condition the skin more effectively than whole plant extracts.

The resulting filtrate functions primarily as a conditioning agent, helping to soften, smooth, and maintain moisture in both the stratum corneum (outer skin layer) and hair fibre. The probiotic and mushroom components may also contribute antioxidant and skin-soothing properties, though their individual contributions within this blend are not fully established.

How It Works

The fermentation process breaks down complex plant and microbial structures into smaller, more bioavailable molecules. These smaller compounds can penetrate the outer layers of skin more easily, where they work as humectants and emollients—drawing moisture into the stratum corneum and sealing it in.

The polysaccharides and beta-glucans present in mushroom extracts are thought to interact with skin receptors involved in hydration and protective barrier function. Lactobacillus fermentation also produces organic acids and peptides that may support skin pH balance and the natural microbiota, though the extent of this benefit in a cosmetic product depends on stability and concentration.

Clinical Evidence & References

Clinical research specifically on this ferment filtrate blend is limited. However, individual components have been studied: mushroom polysaccharides have shown promise in in vitro studies for antioxidant activity and barrier support, whilst Lactobacillus fermentates are increasingly recognised in dermatological research for their potential to support skin microbiome health and reduce inflammation.

Most evidence supporting this ingredient comes from traditional use, ingredient supplier data, and preliminary research on its individual components rather than dedicated clinical trials on the complete blend. Further human studies would help clarify its efficacy at typical cosmetic concentrations.

How to Use

This ingredient is typically found in hydrating serums, essences, conditioning masks, and hair care products. It performs best in formulations designed to remain on the skin or hair for several minutes, allowing the conditioning compounds time to adsorb. It is generally suitable for layering with other actives, though you may wish to apply hydrating ingredients like this before lighter textures (serums before creams). Use daily or as part of your regular routine; there is no need for cycling.

Safety & Precautions

This ingredient is generally well-tolerated and suitable for most skin types, including sensitive skin. Those with documented mushroom or mould sensitivities should patch-test first, as fermented ingredients may cause sensitivity in rare cases.

Frequently Asked Questions

From the Clinic

Not sure what your skin actually needs?

Two minutes, a few questions, and we’ll point you at what matters — no guesswork.

Take the skin quiz

Learn More About Skincare Ingredients

Explore our comprehensive ingredient glossary to understand what's in your products.

Browse All Ingredients

Authorised Stockist

Official UK retailer

Tracked Delivery

Free UK shipping over £50

5 Star Rating

Trusted by thousands

Expert Advice

Free consultations