Stadler Form’s oil blends are 100% all-natural and produce fragrant room scents. The scented oils are made in Switzerland from high-quality plant essences and are bottled by hand. They are all produced in an environmentally sustainable way and are not tested on animals. While REFRESH provides a refreshing, citrusy fragrance, RELAX also smells of wood and lavender. In contrast, REVIVE smells more like fir and therefore slightly harsh.