A method for restoring catalytic activity to a spent hydroprocessing catalyst, which hydroprocessing catalyst comprises a Group VIB metal component of a Group VIII metal component, or both metal components on a support material, and wherein the hydroprocessing catalyst has become spent due to its use having a carbon content above 0.5 wt%, to provide an additive impregnated composition, wherein said method comprises: regenerating said spent hydroprocessing catalyst to remove at least a portion of the carbon therefrom to provide a regenerated hydroprocessing catalyst; treating said regenerated hydroprocessing catalyst with a chelating agent, selected from the group of compounds consisting of aminocarboxylic acids, polyamines, aminoalcohols, oximes, and polyethyleneimines, by incorporating said chelating agent into said regenerated hydroprocessing catalyst to thereby provide a chelant treated regenerated hydroprocessing catalyst; drying said chelant treated regenerated hydroprocessing catalyst to provide a dried chelant treated regenerated hydroprocessing catalyst having a volatiles content in the range of from 0.5 to 25 wt % LOI, wherein LOI is loss on ignition, which is defined as the percentage weight loss of the material after its exposure to air at a temperature of 482 °C for a period of two hours, which can be represented by the following formula: (sample weight before exposure less sample weight after exposure) multiplied by 100 and divided by (sample weight before exposure); and incorporating a polar additive, being a heterocompound selected from the group of amide compounds, having a polarity and a dipole moment of at least 0.45, into said dried chelant treated regenerated hydroprocessing catalyst by pore volume impregnation to thereby provide said additive impregnated composition comprising the regenerated hydroprocessing catalyst, the chelating agent and the polar additive. regenerating said spent hydroprocessing catalyst to remove at least a portion of the carbon therefrom to provide a regenerated hydroprocessing catalyst; treating said regenerated hydroprocessing catalyst with a chelating agent, selected from the group of compounds consisting of aminocarboxylic acids, polyamines, aminoalcohols, oximes, and polyethyleneimines, by incorporating said chelating agent into said regenerated hydroprocessing catalyst to thereby provide a chelant treated regenerated hydroprocessing catalyst; drying said chelant treated regenerated hydroprocessing catalyst to provide a dried chelant treated regenerated hydroprocessing catalyst having a volatiles content in the range of from 0.5 to 25 wt % LOI, wherein LOI is loss on ignition, which is defined as the percentage weight loss of the material after its exposure to air at a temperature of 482 °C for a period of two hours, which can be represented by the following formula: (sample weight before exposure less sample weight after exposure) multiplied by 100 and divided by (sample weight before exposure); and incorporating a polar additive, being a heterocompound selected from the group of amide compounds, having a polarity and a dipole moment of at least 0.45, into said dried chelant treated regenerated hydroprocessing catalyst by pore volume impregnation to thereby provide said additive impregnated composition comprising the regenerated hydroprocessing catalyst, the chelating agent and the polar additive.