Providing relief to singers, speakers, salespeople and other vocalizers. Thayers Slipper Elm Lozenges, Natural Cherry Flavor Thayers slippery elm lozenges have been providing relief to singers, speakers, salespeople and other vocalizers. Naturally tangy and sweet, slippery elm cherry lozenges are a delightful balm for irritated throats and hoarse voices. Slippery elm tree (ulmus fulva), these dependable demulcents soothe the tissues of the mouth and throat and restore the voice without the dulling effects of menthol.