This formula provides a full 320mg of real beta sitosterol per 2 tablets and we use the highest quality available. It also contains 10µg of vitamin D3 per daily dose, as it plays an important role in the normal function of the immune system and healthy inflammatory response. Zinc, which contributes to the maintenance of normal testosterone concentrations in the blood is included at 15mg. Plus both vitamins C and E have been included which, like zinc, help to protect cellular components from oxidative damage. Prostex® also includes three important amino acids - alanine, glycine and glutamic acid, as well as a relevant level of the bioflavonoid, quercetin.