This work presents Adaptive Vgs Multiplexer (AVGS-Mux) Technique. Proposed method controls the transistor current by the source voltage. It can provide ±1.6X control on the delay and ±7X exponential control on sub-threshold and gate leakages in the switch-box, LUT, and interconnects. For equal leakage, it improves the speed 9%, reduces dynamic power 13%, and reduces random dopant fluctuations effect. AVGS-Mux is a good replacement of adaptive body biasing and adaptive supply voltage techniques in emerging Multi-Gate devices which have very small body effect and cannot tolerate voltages higher than nominal VDD due to reliability issues.