Galactomyces/Milk Ferment Filtrate

Galactomyces, also known as milk ferment filtrate, is a byproduct of fermented milk created using the Galactomyces fungus. During fermentation, beneficial compounds are produced and concentrated in the liquid filtrate, which is then harvested for use in skincare.In formulations, this ingredient functions primarily as a humectant—a substance that draws water into the skin and helps it retain moisture. It also contains amino acids, peptides and other fermentation metabolites that may support skin hydration and texture.

Galactomyces works as a humectant by attracting water molecules from the environment and deeper skin layers, then binding them at the surface. This helps plump the skin and can temporarily reduce the appearance of fine lines caused by dehydration.The fermentation process also produces bioactive compounds—including amino acids and organic acids—that may support the skin's natural pH balance and provide gentle exfoliating properties without the irritation of physical or chemical scrubs.

Galactomyces is typically found in essences, toners, serums and sheet masks at concentrations that allow for daily use. Apply to clean, damp skin and layer with a moisturiser to lock in hydration. It works well in layered routines and pairs effectively with other hydrating or barrier-supporting ingredients.

Generally well-tolerated and considered safe for topical use. Avoid if you have a known sensitivity to fermented ingredients or fungi-derived products, though true allergic reactions are uncommon.