Hydrolyzed Rhodophycea (Red Algae) Extract


Plant extracts

Hydrolyzed Rhodophycea (Red Algae) Extract description

Hydrolyzed rhodophycea is a type of red algae that, like most other types used in skin care products, helps improve skin’s hydration and ability to look healthy while also being a good source of antioxidants. Research has shown the antioxidants in many types of algae, including red algae, help offset the oxidative damage UVB light exposure triggers. Red algae is a rich source of carrageenan, which in cosmetics serves as a natural thickening and gelling ingredient. Interestingly, the structure of carrageenan closely resembles glycosaminoglycans, which are a key part of skin’s barrier. In this capacity, the carrageenan in red algae can help deliver other ingredients throughout skin’s uppermost layers. Along with carrageenan, red algae is a source of plant cholesterol, whose fatty acid compounds benefit skin.

Hydrolyzed Rhodophycea (Red Algae) Extract references

  • Marine Drugs, October 2018, ePublication; and July 2015, pages 4,197-4,216
  • Journal of Biomaterials Applications, September 2018, pages 422-434
  • Free Radical Research, June 2017, pages 555-567

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


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Not Rated