Phosphoricum acidum is used as a Homeopathic or used simply as a micro-nutritional (mineral acid). Homeopathic potencies accredit their strength and efficacy to the electromagnetic signatures of the original substrate; these are scientifically created dilutions and succussions of medicines such that generally not even a molecule of the original substrate or medicine is present in the medicine.

As a Homeopathic or used simply as a micro-nutritional, Phosphoricum acidum has demonstrated effectiveness against the following symptomology: "Urine is increased, perhaps milky in color and containing much sugar. It suits cases due to grief, worriment and anxiety, those who are indifferent and apathetic, poor in mental and physical force. It is unquestionably curative of diabetes mellitus in the early stages, great debility and bruised feeling in the muscles. There will be loss of appetite, sometimes unquenchable thirst and perhaps the patient will be troubled with boils. When patients pass large quantities of pale colorless urine or where there is much phosphatic deposit in the urine, it is the remedy." (Dewey)