Cleanmarine Krill Oil for Women with added B Vitamins, MCT's and Soy Isoflavones. Ideal for women of all ages. Isoflavones are a class of phytoestrogens, plant-derived compounds with estrogenic activity. Soybeans and soy products are the richest sources of isoflavones in the human diet. Soy may support better menstrual health by favourably altering oestrogen levels and oestrogen metabolism.