What Is Pseudoalteromonas Exopolysaccharides?
Pseudoalteromonas Exopolysaccharides are long-chain sugars secreted during the controlled fermentation of the marine bacterium Pseudoalteromonas, a microorganism that thrives in cold ocean waters. Chemically they are complex polysaccharides composed mainly of glucose, galactose and mannose units along with trace minerals picked up from the seawater in which the bacteria originally live. Interest in these marine-derived sugars began in the 1990s when researchers noticed their ability to retain moisture and protect the bacterium from harsh salt and temperature shifts. Cosmetic chemists soon saw parallels with what human skin needs, leading to their inclusion in skincare formulas.
Production starts with cultivating Pseudoalteromonas in large sterile tanks filled with a nutrient broth. As the culture grows the bacteria release exopolysaccharides into the liquid. The broth is then filtered to remove the cells, concentrated and gently precipitated to separate the polysaccharides. After thorough purification the material is dried into a fine powder or kept as a concentrated solution ready for blending into cosmetic bases.
You will most often find Pseudoalteromonas Exopolysaccharides in hydrating sheet masks, anti aging serums, rich moisturizers, soothing after-sun lotions and barrier repair creams where a lightweight yet lasting moisture boost is desired.
Pseudoalteromonas Exopolysaccharides’s Cosmetic Benefits/Uses
This ingredient serves one primary role in skincare formulations.
Skin conditioning: By forming a breathable film on the surface of the skin, these marine polysaccharides help draw in water and hold it there, leaving the complexion feeling soft, plump and smooth. The film also supports the skin’s natural barrier, which can reduce the appearance of dryness and fine lines while lending a fresh, dewy look.
Who Can Use Pseudoalteromonas Exopolysaccharides
Pseudoalteromonas Exopolysaccharides are considered gentle and non occlusive which makes them appropriate for most skin types including dry, normal, combination and oily. Their lightweight water-binding film hydrates without leaving a greasy residue so even blemish-prone complexions usually tolerate them well. Sensitive skin can also benefit since the ingredient is non acidic and free of common irritants. At this time there are no specific concerns that make it unsuitable for any particular skin type.
The material is produced via bacterial fermentation, not animal farming, so it is generally viewed as suitable for vegans and vegetarians. Always confirm the finished product has been certified cruelty free if that is a priority because testing policies vary by brand.
No data points to problems for pregnant or breastfeeding users when Pseudoalteromonas Exopolysaccharides are applied topically in cosmetic amounts. That said this is not medical advice. Anyone who is expecting or nursing should review their skincare routine with a qualified healthcare provider for personal guidance.
The ingredient does not make skin more sensitive to sunlight and there is no evidence it interacts with UV filters or photosensitizing actives. Continue to use daily sunscreen as usual for overall skin health.
Potential Side Effects/Adverse Reactions
Responses to any cosmetic ingredient can differ between individuals. The effects listed below are rare possibilities rather than the typical experience when products are formulated and used as directed.
- Mild redness or itching
- Transient stinging on very compromised or freshly exfoliated skin
- Allergic contact dermatitis in those with a specific sensitivity to marine polysaccharides
If irritation or another unwanted reaction develops stop using the product and seek professional medical advice if symptoms persist.
Comedogenic Rating
Rating: 0 / 5
Pseudoalteromonas Exopolysaccharides are large water-soluble sugar molecules that sit on the skin as a light breathable film rather than seeping into pores. They contain no oils or waxy fats so they do not add to the buildup that can trap dead cells and trigger bumps. Formulas that rely on this ingredient for hydration are therefore unlikely to clog pores on their own.
In most cases this makes the ingredient friendly for acne-prone and breakout-prone skin. As always the final product’s full formula matters, especially if it pairs the polysaccharide with heavier emollients.
Summary
Pseudoalteromonas Exopolysaccharides are marine-derived polysaccharides valued for skin conditioning. They attract and hold water at the surface while forming a sheer protective film that supports the barrier so skin feels smoother, looks plumper and retains moisture longer.
The ingredient sees moderate use, showing up mostly in mid to high-end serums masks and creams that market a “marine” or “biotech” story. Its popularity is growing as brands look for gentle hydrating alternatives to heavier occlusives.
Current research and user reports point to a high safety profile with very low irritation or comedogenic risk. Even so skin is personal so it is wise to patch test any new product that contains this or any active to make sure it suits you.