Willow

The leaf and bark of willow (Salix spp.) has been used to reduce fevers and relieve pain for over 3500 years, first by ancient Egyptians. It contains salicin, a compound similar to acetylsalicylic acid (commonly known as aspirin). Willow bark's bitter taste attests to its cooling, anti-inflammatory nature which can soothe irritated conditions such as bursitis, tendonitis, arthritis, and some types of headaches.