Phosphorus is the second most abundant mineral in the body, after calcium. About 85% of phosphorus in the body exists in bone.
Phosphorus’ functions include:
Recommended Dietary Allowance
|0-6 months||No RDA; Adequate Intake (AI) = 100|
|7-12 months||No RDA; AI = 275|
|19 years and older||700|
|Pregnancy and lactation, 18 years and younger||1,250|
|Pregnancy and lactation, 19 years and older||700|
Phosphorus deficiency is called hypophosphatemia. Since phosphorus is present in such a large variety of foods, dietary phosphorus deficiency is rare.
Symptoms of hypophosphatemia may include:
Phosphorus toxicity is rare in people with normal kidney function. However, those with kidney problems may experience hyperphosphatemia, or elevated levels of phosphorus in the blood. Hyperphosphatemia can result in decreased levels of calcium in the blood and overproduction of parathyroid hormone, which can lead to bone loss.
The following table shows the upper intake levels for phosphorus. But, it's important to note that these levels are not created for people with kidney disease. If you have problems with your kidneys and are concerned about your phosphorus intake, talk to your doctor.
Tolerable Upper Intake Level (UL)
|0-12 months||This amount has not been established.|
|70 years and older||3,000|
|Pregnancy and lactation||3,500 and 4,000|
Are you looking to add more phosphorus to your diet? Here are some good food sources:
|Skim milk||8 ounces (227 grams)||247|
|Plain, nonfat yogurt||8 ounces (227 grams)||306|
|Part-skim mozzarella cheese||1 ounce (28 grams)||131|
|Beef||3 ounces (85 grams)||179|
|Chicken||3 ounces (85 grams)||135-196|
|Turkey||3 ounces (85 grams)||217|
|Fish (halibut)||3 ounces (85 grams)||244|
|Fish (salmon)||3 ounces (85 grams)||315|
|Almonds||1 ounce (28 grams)||136|
|Peanuts||1 ounce (28 grams)||108|
|Lentils||4 ounces (113 grams)||178|
Choose My Plate—US Department of Agriculture
Eat Right—Academy of Nutrition and Dietetics
Dietitians of Canada
Block GA, Port FK. Re-evaluation of risks associated with hyperphosphatemia and hyperparathyroidism in dialysis patients: recommendations for a change in management. Am J Kidney Dis. 2000;35(6):1226-1237.
Hyperphosphatemia—approach to the patient. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T116059/Hyperphosphatemia-approach-to-the-patient. Updated February 2, 2017. Accessed March 10, 2017.
Hypophosphatemia—approach to the patient. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T115235/Hypophosphatemia-approach-to-the-patient. Updated February 2, 2017. Accessed March 10, 2017.
Phosphorus. Oregon State University Linus Pauling Institute website. Available at: http://lpi.oregonstate.edu/mic/minerals/phosphorus. Updated June 2014. Accessed March 3, 2017.
The benefits of phosphorus. Vitamins-Nutrition website. Available at: http://www.vitamins-nutrition.org/vitamins/phosphorus.html. Updated March 10, 2017. Accessed March 10, 2017.
Last reviewed March 2017 by Michael Woods, MD, FAAP
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.