The compositions disclosed herein employed to improve the bioavailability of poorly soluble or poorly bioavailable lipophilic bioactive substances. The bioactive substances are encapsulated in fenugreek fibre compositions to form hydrophilic powder compositions. The special grade fenugreek fibre has high lipophilic holding capacity and also ensure the consistent release of bioactive substances. The present invention further provides process for the preparation of powder lipophilic bioactive substances