Natrum Phosphoricum-12X is a homeopathic remedy that is made from the mineral compound sodium phosphate. It is used to treat acid-related digestive disorders such as heartburn, indigestion, and acid reflux. It is also believed to help with fatigue, headaches, and joint pain. This remedy is safe and natural, with no known side effects or interactions with other medications. Natrum Phosphoricum-12X is available in tablet form and should be taken under the guidance of a licensed homeopathic practitioner.