These data belong to the comprehensive study of polyphenols in Laminaria hyperborea, Laminaria digitata, Saccharina latissima, Ascophyllum nodosum and Fucus vesiculosus performed in relation with the
Polyphenols comprise the largest group of plant secondary metabolites and have critical roles in plant physiology and response to the biotic and abiotic environment. Changes in the content of polyphen
