Helps relieve stress, simple nervous tension, and headaches¹ Kali Phos. (Kali Phosphoricum), the nerve nutrient cell salt, offers restorative relief for symptoms of stress and nervous tension, occasional sleeplessness, and headaches by helping the body control pain signals, localize or resolve pain, and calm responses.¹ Tablets are flavorless and dissolve immediately without water for no upset stomach.