Alteromonas Ferment Filtrate

Alteromonas Ferment Filtrate is a filtrate derived from the fermentation of Alteromonas, a marine bacterium. The fermentation process breaks down the organism to create a liquid ingredient rich in polysaccharides and other humectant compounds that have an affinity for water.

In skincare formulations, this ingredient functions primarily as a humectant—a substance that draws moisture from the environment and deeper skin layers to the surface, helping to improve hydration levels in the stratum corneum (the skin's outermost layer).

As a humectant, Alteromonas Ferment Filtrate works by drawing water molecules into the stratum corneum through osmotic pressure. The polysaccharides present in the filtrate are hygroscopic—they naturally attract and hold onto moisture, which can help plump the skin and reduce the appearance of dryness or fine lines caused by dehydration.

Because it is derived from a fermented source, the ingredient may also contain amino acids and other small molecular compounds produced during fermentation that can support the skin's natural moisture-binding factors, though the extent of these benefits depends on formulation and concentration.

Alteromonas Ferment Filtrate is typically found in serums, essences, toners, and hydrating creams. As a humectant, it works best when applied to damp skin, allowing it to lock in moisture more effectively. It pairs well with occlusive ingredients (such as oils or ceramides) to seal hydration in place, and can be used daily as part of a morning or evening routine.