1. Thyme (Thymus vulgaris) - tea or essential oil
2. Echinacea (Echinacea spp.) - immune system support
3. Marshmallow root (Althaea officinalis) - soothing, protective
4. Licorice root (Glycyrrhiza glabra) - anti-inflammatory, expectorant
5. Slippery elm (Ulmus rubra) - soothing, protective