Jackson's Mineral Salts #6 Potassium Phosphate 6X - According to Dr. Schuessler and other homeopathic references, Kali phosphoricum (Kali phos) is an important mineral salt in the body for nervous system health. Headaches of a nervous origin, sleeplessness, depression, anxiety, and weariness from overtaxed nervous system are all related to an imbalance of this salt in the body.