Sulfated polysaccharides support surface hydration
Forms a moisture binding film on skin
Provides antioxidant activity against environmental stress
Suits marine derived, ocean inspired formulas
Red Algae Extract Description
Red algae extract comes from any of a large number of seaweed species that make up a broad marine plant group. To survive their salty, ever changing environment, these algae build their cell walls out of gel like sugar compounds, including ones called carrageenan and agar, that help the plant hold onto water and stay resilient under stress.
Research looking at these algae derived sugar compounds has found they can form a moisture binding film on skin, helping it hold onto water in much the same way hyaluronic acid does. Separate research on this same category of compounds has found additional benefits too, including antioxidant activity and general support for skin tissue. Because red algae covers so many different species, and because extraction methods vary, the strength and makeup of a given red algae extract can differ quite a bit from one product to the next.
Red Algae Extract References
Beneficial Effects of Marine Algae Derived Carbohydrates for Skin Health, PMC, 2018
Sulfated Galactans From Red Algae: Cutting Edge Extraction, Purification, Structural Characterization, Bioactivities, and Biomedical Applications: A Review, 2026
Our team reviews ingredient research and uses up-to-date evidence to rate ingredients based on the categories below.
Best
Ingredients with the most rigorous and convincing evidence. These are the standouts backed by consistent findings across independent, peer reviewed clinical research.. When we call an ingredient Best, it has earned that distinction through genuine, reproducible proof that it improves skin.
Good
Reliable, well tolerated ingredients that do their job without complaint. They may not carry the headline benefits of a Best rated active, but they hydrate, stabilize a formula, or support the ingredients around them in ways that make a real difference in how a product performs and feels.
Average
Ingredients that are perfectly safe and serve a clear function, typically as an emollient, thickener, or filler, but do not offer any meaningful skin benefit beyond that basic job. Not a red flag, just not a reason to choose one product over another.
Bad/Worst
Ingredients with documented potential to irritate skin, disrupt the barrier, or trigger sensitization in some users, often synthetic fragrance, drying forms of alcohol, or certain essential oils. Not automatically a dealbreaker for every skin type, but worth knowing about before you commit to a product.
