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We examine a scenario for freeze-in production of dark matter, which occursdue to the large thermal correction to the mass of a decaying mediator particlepresent in the thermal bath of the early Universe. We show that the decays,which are kinematically forbidden otherwise, can open up at very hightemperatures and dominate the dark matter production. We explore such forbiddenproduction of dark matter in the minimal $U(1)_{B-L}$ model, comparing darkmatter phenomenology in the context of forbidden frozen-in with the standardpicture.

Freeze-in Dark Matter Through Forbidden Channel in $U(1)_{B-L}$