Algal extract comprising sulphated and non-sulphated polyanionic polysaccharides and uses thereof

A method for treating anxiety, the method comprising the administration of an effective amount of an algal extract from the order of Ulvales comprising sulphated and non-sulphated polyanionic polysaccharides, the size of which is less than or equal to 50 kDa, wherein the algal extract is prepared by a process comprising the following steps:

• a) washing the algae and freeing the algae of sand;
• b) crushing the washed and freed algae to create a crushed product comprising a solid phase and a liquid phase;
• c) separating the solid phase of the crushed product from the liquid phase of the crushed product;
• d) clarifying the separated liquid phase to form a juice;
• e) filtering the juice with a membrane of less than 50 kDa;
• and
• f) concentrating the filtered juice;
• and
• g) drying the concentrated juice.