FIELD: chemistry.
SUBSTANCE: invention relates to a method of enriching a photosynthesising microorganism, selected from green algae and blue-green algae with organic selenium. The photosynthesising microorganism is cultured in a medium containing a compound of the type of selenium-containing hydroxy acid of general formula 
, with a salt, ester or amide derivative of said acid. Content of organic selenium in the green algae or blue-green algae is higher than 1000 mcgSe/g of dry weight. Also disclosed is use of the enriched microorganisms as a cosmetic, pharmaceutical or food agent.
EFFECT: enriching photosynthesising microorganisms with non-toxic organic selenium with high output.
16 cl, 3 tbl, 4 ex
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