Invention herewith described refers to the natural dietary supplement &ndash the capsule intended for peroral use containing as the active ingredient from 1 to 99 weight units of 100% pure powder of dried oyster, also known as the forest oyster mushroom (Pleurotus ostreatus), and/or from 1 to 99 parts of weight units of probiotic bacterial strain, and/or from 1 to 99 parts of weight units of probiotic strain of the yeast fungi.Prirodni dodatak ishrani - kapsula namenjena za peroralnu upotrebu sadrži kao aktivnu supstancu od 1 do 99 težinskih jedinica 100% čistog praha sušene bukovače, poznate i pod imenom šumska ostriga (Pleurotus ostreatus), i/ili od 1 do 99 težinskih jedinica probiotskog bakterijskog soja, i/ili od 1 do 99 težinskih jedinica probiotskog soja kvasnih gljivica.