Prebiotic/Probiotic/Postbiotic

Dioscorea Japonica Fruit … Ferment Filtrate

INCI: DIOSCOREA JAPONICA FRUIT/CALCIUM HYDROXIDE/MAGNESIUM HYDROXIDE/POTASSIUM OXIDE/SILICA/SODIUM HYDROXIDE/SUCROSE FERMENT FILTRATE

Reviewed by Daisy · Last updated 2 Jun 2026

A fermented complex that conditions and protects the skin barrier

Best For Skin Types

All, Dry, Sensitive, Combination

Addresses

Dryness, Hydration, Barrier repair, Sensitivity

Usage Frequency

Daily

What Is Dioscorea Japonica Fruit … Ferment Filtrate?

This ingredient is a composite of fermented plant extracts and mineral compounds. The primary component is a filtrate derived from fermented sucrose and Dioscorea japonica (Chinese yam) fruit, combined with naturally occurring mineral hydroxides and silica. The fermentation process breaks down larger molecules into smaller, more bioavailable forms that the skin can more readily absorb.

The mineral components—calcium hydroxide, magnesium hydroxide, potassium oxide and sodium hydroxide—function as pH buffers and mineral-rich conditioners within the formulation. Silica acts as a texturising agent and skin protectant. Together, these components work to support the skin's natural barrier function and overall condition.

How It Works

The fermented filtrate delivers conditioning compounds that interact with the skin's stratum corneum, the outermost protective layer. Fermentation produces smaller molecular fragments—amino acids, peptides and organic acids—which can penetrate and support skin health more effectively than whole plant material.

The mineral hydroxides and silica work primarily at the surface, forming a semi-occlusive barrier that reduces transepidermal water loss whilst allowing the skin to breathe. This combination of internal conditioning and surface protection supports the skin's natural ability to maintain hydration and integrity.

Clinical Evidence & References

Research specific to this exact ingredient combination is limited. However, individual components have established roles in skincare. Fermented plant extracts are recognised for their ability to improve skin hydration and texture. Silica is well-documented as a skin-conditioning agent with protective properties.

The mineral hydroxides serve primarily as pH regulators and mineral sources rather than active therapeutic agents. Overall, this ingredient is positioned as a supportive, conditioning component rather than a corrective one. More targeted clinical data on the complete formula would strengthen confidence in specific efficacy claims.

How to Use

This ingredient is typically found in moisturisers, serums and barrier-support products. Apply to clean skin, either alone or as part of a layered routine. It works well in combination with other hydrating or barrier-repair ingredients. Use consistently as directed by the product formulation—usually once or twice daily depending on your skin's needs and the product type.

Safety & Precautions

Generally well-tolerated by most skin types. The mineral alkaline compounds are pH-buffered within the formulation. Those with very sensitive skin or known sensitivities to fermented ingredients should patch-test first.

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