yok4dYok3D ® is the ultimate non-stimulant Nitic Oxide stimulator developed by USP Labs. The main ingredient in Yok3D ® is Inositol-stabilized Citrul Silicate (Citrul Silicate as Nitro-Rx ®),YOK4D MANIA, Jakarta, Indonesia. 1 like. BONUS BONUSAN TERUS DISINI!