Additive manufacturing techniques can now be utilized as innovative tools that provide unlimited design flexibility for the fabrication of geometrically complex metallic structures. For production of Ni-base superalloy components used in advanced gas turbine engines, these techniques may enable transformational design concepts and contribute to the development of ultra-efficient power systems for aerospace propulsion, space exploration and power generation. One of the major challenges associated with additively manufactured Ni-base superalloy components is that the extreme temperature gradients encountered during processing negatively impact the underlying microstructure and mechanical properties of the material. Although the macroscopic shape and chemistry of the additively fabricated part may be identical to the conventionally manufactured part, the resulting properties are usually compromised. In an effort to make Ni-base superalloys more amenable for processing via additive manufacturing, varying levels of benign inoculants that promote heterogeneous grain nucleation were blended into IN718 powder feedstock and used for processing via LPBF, EBPBF and DED. For nominally identical processing conditions, the inoculants were found to reduce the average grain size and grain size distributions in as-fabricated specimens. Processing conditions that promote agglomeration and the effectiveness of inoculants on modifying the resulting grain structure during additive manufacturing will be discussed.