What Is Oblongichytrium Sp. Pb-55 Polysaccharides?
Oblongichytrium Sp. Pb-55 Polysaccharides is a blend of sugar molecules taken from the marine microorganism Oblongichytrium sp. PB-55, a type of single-cell algae-like organism found in seawater. These natural sugars form a lightweight film that attracts and locks in moisture. Interest in this microbe began with research into sustainable marine ingredients in the early 2000s, and its polysaccharides soon caught the eye of cosmetic labs looking for plant-free hydration boosters.
The ingredient is produced through controlled fermentation: scientists grow the microorganism in stainless-steel tanks, then separate the cells from the liquid. Gentle water-based extraction draws out the polysaccharides, which are filtered, concentrated and spray-dried into a fine powder. Because the process relies on fermentation rather than farming, it offers a steady supply with minimal environmental impact.
Formulators slip Oblongichytrium Sp. Pb-55 Polysaccharides into moisturizers, hydrating serums, sheet masks, soothing after-sun gels, anti-aging creams and even makeup primers where a smooth skin feel is desired.
Oblongichytrium Sp. Pb-55 Polysaccharides’s Cosmetic Benefits/Uses
In skincare formulas this ingredient works in several helpful ways:
- Humectant: Draws water from the air and deeper skin layers to the surface, giving an instant plumping and smoothing effect while reducing the look of fine lines
- Skin Conditioning: Leaves the skin soft and supple by forming a breathable film that helps maintain a healthy moisture balance over time
- Skin Protecting: Creates a light barrier that shields skin from daily pollutants and dehydration, supporting the natural protective mantle
Who Can Use Oblongichytrium Sp. Pb-55 Polysaccharides
This marine-derived humectant suits nearly every skin type. Dry or dehydrated complexions benefit from its moisture-locking film while oily and combination skin appreciate the lightweight non-greasy feel that will not clog pores. Those with sensitive or compromised barriers generally tolerate it well because it contains no fragrance or common irritants.
The ingredient is produced through microbial fermentation with no animal inputs so it is considered appropriate for vegans and vegetarians.
No data suggest the ingredient poses a risk for women who are pregnant or breastfeeding when used topically in normal cosmetic concentrations. Still, this is not medical advice and anyone who is pregnant or nursing should check with a doctor before adding new skincare products.
Oblongichytrium Sp. Pb-55 Polysaccharides does not make skin more sensitive to the sun and can be worn alongside daily sunscreen. It is also compatible with most other skincare actives, including retinoids and exfoliating acids.
Potential Side Effects/Adverse Reactions
Responses to topical Oblongichytrium Sp. Pb-55 Polysaccharides can vary from person to person. The effects listed below are only potential outcomes and are unlikely for the average user when the ingredient is correctly formulated.
- Mild redness or itching in very sensitive individuals
- Transient stinging if applied to freshly exfoliated or broken skin
- Allergic contact dermatitis in people extremely sensitive to marine polysaccharides
- Reaction to a preservative or fragrance in the finished product rather than the polysaccharide itself
If any irritation or unusual reaction occurs discontinue use and seek advice from a healthcare professional.
Comedogenic Rating
Rating: 0 / 5
Oblongichytrium Sp. Pb-55 Polysaccharides is made up of large water-soluble sugar molecules that sit on the surface of skin rather than seeping into pores or mixing with sebum. Because it forms a lightweight hydrating film and contains no oils, waxes or fatty acids, it does not create the kind of environment that encourages pore blockages or blemishes.
Suitable for acne-prone and breakout-prone skin types.
As with most humectants, the ingredient is normally used at low to moderate concentrations and is rinsed off or layered under other products, which further limits any risk of congestion.
Summary
Oblongichytrium Sp. Pb-55 Polysaccharides is a marine-derived humectant that pulls water to the skin surface, conditions by forming a soft moisture-retaining film and offers a light protective shield against everyday irritants. Those actions translate to smoother, plumper and better defended skin.
Still a niche ingredient, it is gaining traction with brands focused on sustainable fermentation tech and clean hydration boosters, but you will not yet find it in every mainstream moisturizer.
Current data show it is gentle, non-comedogenic and generally safe for all skin types, including sensitive and acne-prone. As with any new cosmetic ingredient, it is smart to do a quick patch test when trying a fresh product to make sure your skin agrees.