Jackson's Mineral Salts #10 Nat Phos 6X - According to Dr. Schuessler and other homeopathic references, Natrum phosphoricum (Nat phos) is an important mineral salt in the body for acid neutralization. Gastric disturbances and upsets especially from fatty foods, intestinal disorders, and rheumatic pains in joints are all related to an imbalance of this salt in the body.