Martin & Pleasance Schuessler Tissue Salts Kali Phos: Nerve Nutrient - A Homeopathic remedy traditionally used for the temporary relief of: nervous tension, irritability and tension headaches. Kali Phos is found in the tissues and fluids of the body notably of the brain and nerve cells and is the principal tissue salt for the nervous system. Kali Phos is vital for regeneration of nerve tissue and forms “Grey matter”. Kali Phos is indicated for the treatment of nervous headaches, nervous dyspepsia, sleeplessness, weariness, lowered vitality, low mood and other similar conditions.