you’ll probably find the invigorating scent of menthol familiar as menthol crystals are widely used in cosmetics, hair products, lozenges, and of course, in aromatherapy. harmonizing beautifully with our essential oil blends, menthol crystals have been known to promote easier breathing and temporarily relieve congestion. the cool, refreshing scent of menthol crystals can leave you feeling stimulated and refreshed.