Extract of Thongweed

Himanthalia elongata is an elixir of youth for the skin. Rich in vitamins, this seaweed helps to moisturise and bring radiance to the skin to reduce the visible signs of ageing.


According to the literature survey: Himanthalia elongata (%)
Fucoidanes 18 | Alginate 16 | Mannitol 5,2 | Vitamin A 0,08 | Vitamin C 0,12 | Vitamin K 0,17


Thongweeds are harvested by the company BioMolenez. This seaweed is harvested from tidal coefficients of around 85, mainly between April and mid-July. Harvesting is done by hand, using a sickle or a knife.

It prefers the shallow waters of the infralittoral zone. Once harvested, the seaweed is macerated and filtered to obtain an extract containing a maximum of bioactive compounds.

Mainly found in the cold coastal waters of the North Atlantic, especially in the coastal regions of Western Europe, such as the UK, France, Spain, Portugal and Ireland. It is also found in the coastal waters of North America, such as Canada and the United States. It can be found in the upper littoral stages, such as the upper intertidal and sublittoral. It is generally found in areas exposed to waves and strong currents, such as rocks and stones, and prefers areas with high salinity. It is more rare in the coastal waters of the Mediterranean Sea.

Temperature tolerance: 0 to 20

Cosmetic properties


Vitamin A helps to limit the appearance of brown spots and wrinkles


The presence of alginate and mannitol allows the hydration of the upper layers of the epidermis thanks to a hydrophilic effect.


Fucoidanes have a strong antioxidant power to reduce oxidative stress. The richness of the algae in vitamins increases the antioxidant effect.


Vitamin A is involved in tissue regeneration by stimulating keratogenesis.

Proposed extracts

100% Natural

An extract containing the seaweed, glycerine and an acid


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For which products?

Face & body care

Hair care

Formulation characteristics

  • 1-5% usage
  • Optimal pH between 4.5 and 6
  • Opalescent (organic) or translucent (100% nat) orange-brown liquid
  • Tested under dermatological control