The disclosure relates to compositions, preferably in the form of a powder and/or granules, which contain as principal components a first component selected from the group consisting of isoflavones, soy products containing at least one isoflavone, and mixtures thereof, together with a polysaccharide as second component. A preferred first component is genistein or a pharmaceutically acceptable salt or derivative thereof (e.g. genistin). A preferred second component is pectin. The disclosure further relates to a process for the manufacture of such compositions, and their use in dietary supplements, pharmaceutical and personal care compositions. The disclosure is also directed to the use of a polysaccharide for improving the flowability of a component selected from the group consisting of isoflavones, soy products, preferably those containing at least one isoflavone, and mixtures thereof.