Abstract The effects of transport barriers on impurity transport, specifically helium (He) and tungsten (W), are investigated using the global, flux-driven, full-F, 5D gyrokinetic code GYSELA. barrier is induced by triggering E×B shear via an external poloidal momentum source, thereby stabilizing ITG turbulence reducing outward heat fluxes. These reductions in particle fluxes due to lead enhanced confinement, steepening ion temperature profiles diffusivity main species (i.e. deuterium). Impurity both turbulent neoclassical regimes under various conditions, with without barrier, along a reversed density profile for tungsten. found reduce enhance thermal screening steepened profile. However, it also prevents from being flushed out, increased inward Banana-Plateau (BP) flux, caused asymmetry source. Overall, proves be effective mechanism not only but controlling transport.