Who should not use phosphorus?

Certain people should not use phosphorus or should consult with a doctor before taking it. Your doctor may not recommend phosphorus if you have had conditions, such as high blood pressure, rickets or disease of the heart, liver or kidneys. Phosphorus may interact poorly with a number of medicines, so be sure to disclose all of the medications you are taking to your doctor. People seeking to take phosphorus to treat conditions other than those for which it has been proven effective should be wary, since an overdose can be fatal. Such unproven purposes include enhancement of physical performance and treatment for cancer, depression and multiple sclerosis. People with an allergy to phosphorus should not take phosphorous supplements. Those with diets restricting sodium or potassium might also want to avoid phosphorus supplements, which may contain high levels of these ingredients.