An herbal formulation for the modulation of immune system of HIV infected patients and a process of preparation thereof are provided. The process includes (i) preparing a hydromethanolic extract of at least one plant selected from Hippophae rhamnoides, Convolvulus pluricaulis, Withania somnifera, Ocimum sanctum, and Cynodon dactylon at 80-90° C., maintaining the pH of the solution between 6-7； (ii) separating the active compound chromatographically； and (iii) subjecting the active compounds to the step of molecular characterization.
