Abstract: Pharmaceutical composition comprises of Chlorophyllin or salts thereof and its utilities including method of treatment, enabling the absorption of Copper-isochlorin e4 into human blood that results in an increase in lymphocyte count and decrease in the abundance of hematopoietic stem and progenitor cells (HPSCs) in human blood. The invention is directed to the treatment of conditions including corona-virus infection, immunosuppression, leucopenia and lymphopenia. The composition disclosed in the invention is thus useful for the treatment of corona virus disease caused by SARS-CoV-2 infection by decreasing viral infection, reducing cytokine storm and pro-inflammatory chemokines, reducing epithelial-cell oxidative-stress in the lungs and increasing the production of leukocytes.