Metagene Fusing Solution is an uncommon drop in the R&D Component class.
The items are a possible drop from Lexcorp Agents around Metropolis General Hospital and in the S.T.A.R. Labs Facility and Meta Research Wing challenges.
They also drop from Star Labs personal around Centennial Park and in Midtown, Metropolis.
Metagene Fusing Solution is needed to build Formula of Crushing, Napalm Atomizer and Shock Inducer supply consumables.
This item was introduced with game update 19.