Phosphorus: Fuel For Bones & Beyond
Aug 4, 2025

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Introduction
 Phosphorus (P) is an essential micronutrient that the majority of people either haven't heard of or don't know it's function. It is not produced in the body, and thus it must be consumed; however, it's not required to be on a nutrition facts label, so phosphorus generally flies under the radar. Despite this, it is still important to consume, as optimal levels of phosphorus can have many positive health benefits.


High Phosphorus Foods


Role of Phosphorus
 After calcium, phosphorus is the most abundant mineral in the body, making up about 1-1.4% of fat-free mass. Alond with calcium, phosphorus is an important building block for bones and teeth, as well as DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic acid). Like with calcium, phosphorus is regulated by vitamin D and paraphyroid hormone (PTH). Moreover, phosphorus is involved in the production of ATP, or Adenosine Triphosphate. ATP is the body's main energy source, and also assists in maintaining pH balance, storing energy, and activating enzymes.

 The majority of phosphorus in the body is found in the bones and teeth, at about 85%, found in the form "calcium phosphate". As the name would suggest, calcium phosphare is made up of calcium and phosphorus. The remaining 15% is found in blood and soft tissues. While important to consume, many foods contain phosphorus, and thus the rate of deficiency is low, as about 98% of healthy adults meet the RDA for phosphorus. However, the phosphorus found in nuts, seeds, grains, and beans is bound to phytic acid, which makes it harder to absorb, as human intestines lack the phytase enzyme needed to break down phosphorus into its more usable form. Additionally, calcium can also partially inhibit phosphorus absorption.


Benefits of Phosphorus
  • Maintain strong and healthy bones
  • Assist in making ATP (energy)
  • Assist in muscle movement and contractions
  • Build strong teeth
  • Mangage storage and usage of energy
  • Filter out kidney waste
  • Grow, maintain, and repair cells and tissue
  • Produce DNA and RNA
  • Balance of micronutrients, such as B vitamins, vitamin D, iodine, magnesium, and zinc
  • Maintain regular heartbeat
  • Regulate gene transcription
  • Maintain normal pH in extracellular fluid and intracellular energy storage
  • Activate enzymes
  • Optimal nerve signaling
  • Metabolism of carbs and fats
  • Regulate apoptosis, or natural and controlled cell death


Symptoms and Causes of Low Phosphorus (Hypophosphatemia)
  • Medications such as insulin, corticosteroids, or antacids
  • Diabetes
  • Alcohol use disorder (AUD)
  • Anorexia or starvation
  • Various genetic disorders
  • Joint or bone pain
  • Loss of appetite
  • Irritability or anxiety
  • Fatigue
  • Poor bone development in children
  • Anemia
  • Proximal muscle weakness
  • Bone pain, rickets, and osteomalacia
  • Kidney tuble defects
  • Diabetic ketoacidosis
  • Chronic soda consumption
  • Confusion
  • Increased infection susceptibility
  • Trouble breathing
  • Changes in body weight


Symptoms and Causes of High Phosphorus (Hyperphosphatemia)
  • Oversupplementation of phosphorus
  • Chronic Kidney Disease (CKD)
  • Overuse of phosphorus-containing laxatives or enemas
  • Vitamin D intoxication
  • Hypoparathyroidism
  • Various genetic deficiencies
  • Diarrhea
  • Mineral deposits of calcium in the muscles
  • Decreased ability to use calcium, iron, magnesium, and zinc


On Food and Supplementation
 As many foods contain phosphorus, and as deficiency rates are quite rate, it is not generally recommended to take a phosphorus supplement without recommended by your health practitioner. Compared to calcium, meeting the RDA (or more) of phosphorus through food alone is a much easier task. Additionally, some multivitamins contain phosphorus as well, though the one I take does not. Phosphorus supplements are usually found in the form of phosphate salts (dipotassium phosphate or disodium phosphate) or phospholipids (phosphatidylcholine or phosphatidylserine), and the upper daily limit for phosphorus is about 4,000 mg.


Daily Consumption
  • Recommended Dietary Allowances (RDAs)
    • Birth - 6 months: 100 mg
    • 7 - 12 months: 275 mg
    • 1 - 3 years: 460 mg
    • 4 - 8 years: 500 mg
    • 9 - 18 years: 1,250 mg
    • 19+ years: 700 mg
    • Pregnant & Breastfeeding: 700 mg
    • RDA is the same for male and female
  • Average Daily Intake in Adults
    • Men: 1,744 mg (249 % DV)
    • Women: 1,301 mg (186 % DV)
  • Absorption Rates
    • ~40%: Plant based foods
    • ~60%: Animal based foods
    • ~70% Phosphate salt supplementation
    • Absorption rate of phospholipid supplementation is unknown
  • Optimal blood levels: 2.5 - 4.5 mg/dL (0.81 - 1.45 mmol/L)


Foods High in Phosphorus
Meat (Raw)
Food Serving Size P Per
Serving
P Per
100 g
P Per
100 cal
Beef Liver 4 oz (113 g) 437 mg  387 mg  287 mg 
Chicken Breast
(Boneless & Skinless)
4 oz (113 g) 241 mg  213 mg  177 mg 
Chicken Liver 4 oz (113 g) 336 mg  297 mg  249 mg 
Chicken Thighs
(Boneless & Skinless)
4 oz (113 g) 209 mg  185 mg  153 mg 
Ground Beef
(93% Lean)
4 oz (113 g) 217 mg  192 mg  126 mg 
Ground Turkey
(93% Lean)
4 oz (113 g) 218 mg  193 mg  129 mg 
Pork Liver 4 oz (113 g) 325 mg  288 mg  215 mg 
Pork Tenderloin 4 oz (113 g) 279 mg  247 mg  226 mg 
Venison 4 oz (113 g) 228 mg  202 mg  168 mg 

Fish and Seafood (Raw unless specified)
Food Serving Size P Per
Serving
P Per
100 g
P Per
100 cal
Clams
(Canned)
3 oz (85 g) 158 mg  186 mg  172 mg 
Crab
(Canned)
3 oz (85 g) 199 mg  234 mg  282 mg 
Cuttlefish 3 oz (85 g) 329 mg  387 mg  490 mg 
Haddock 3 oz (85 g) 193 mg  227 mg  307 mg 
Halibut 3 oz (85 g) 201 mg  236 mg  259 mg 
Herring 3 oz (85 g) 201 mg  236 mg  149 mg 
Mackerel
(Canned)
3 oz (85 g) 256 mg  301 mg  193 mg 
Mussels 3 oz (85 g) 167 mg  197 mg  229 mg 
Octopus 3 oz (85 g) 158 mg  186 mg  227 mg 
Salmon 3 oz (85 g) 222 mg  261 mg  205 mg 
Sardines
(Canned)
3 oz (85 g) 417 mg  490 mg  236 mg 
Scallops 3 oz (85 g) 284 mg  334 mg  484 mg 
Shrimp 3 oz (85 g) 207 mg  244 mg  344 mg 
Tilapia 3 oz (85 g) 145 mg  170 mg  177 mg 
Tuna
(Canned)
4 oz (113 g) 157 mg  139 mg  162 mg 

Beans (Dried)
Food Serving Size P Per
Serving
P Per
100 g
P Per
100 cal
Black Beans 1/4 cup (50 g) 169 mg  352 mg  103 mg 
Chickpeas 1/4 cup (50 g) 126 mg  252 mg  67 mg 
Edamame (frozen) 3/4 cup (85 g) 137 mg  161 mg  148 mg 
Green Lentils 1/4 cup (50 g) 141 mg  281 mg  80 mg 
Kidney Beans 1/4 cup (50 g) 203 mg  406 mg  121 mg 
Lima Beans 1/4 cup (50 g) 193 mg  385 mg  114 mg 
Navy Beans 1/4 cup (50 g) 204 mg  407 mg  121 mg 
Pinto Beans 1/4 cup (50 g) 206 mg  411 mg  118 mg 
Red Lentils 1/4 cup (50 g) 147 mg  294 mg  82 mg 
Soybeans 1/4 cup (50 g) 352 mg  704 mg  158 mg 

Nuts and Seeds
Food Serving Size P Per
Serving
P Per
100 g
P Per
100 cal
Almonds 1 oz (28 g) 135 mg  481 mg  83 mg 
Brazil Nuts 1 oz (28 g) 203 mg  725 mg  110 mg 
Cashews 1 oz (28 g) 166 mg  593 mg  107 mg 
Chia Seeds 1 oz (28 g) 241 mg  860 mg  178 mg 
Flax Seeds 1 oz (28 g) 180 mg  642 mg  121 mg 
Hemp Seeds 1 oz (28 g) 462 mg  1650 mg  299 mg 
Pine Nuts 1 oz (28 g) 161 mg  575 mg  86 mg 
Pistachios 1 oz (28 g) 137 mg  490 mg  88 mg 
Poppy Seeds 1 oz (28 g) 244 mg  870 mg  165 mg 
Pumpkin Seeds 1 oz (28 g) 345 mg  1233 mg  221 mg 
Sesame Seeds 1 oz (28 g) 176 mg  629 mg  110 mg 
Sunflower Seeds 1 oz (28 g) 185 mg  660 mg  113 mg 

Grains (Raw)
Food Serving Size P Per
Serving
P Per
100 g
P Per
100 cal
Amaranth 1/4 cup (48 g) 267 mg  557 mg  150 mg 
Brown Rice 1/4 cup (46 g) 143 mg  311 mg  85 mg 
Buckwheat 1/4 cup (43 g) 149 mg  347 mg  101 mg 
Millet 1/4 cup (50 g) 143 mg  285 mg  76 mg 
Oats 1/2 cup (40 g) 164 mg  410 mg  108 mg 
Popcorn 3 tbsp (40 g), unpopped
7.5 cups (40 g), popped
143 mg  357 mg  93 mg 
Quinoa 1/4 cup (43 g) 197 mg  457 mg  124 mg 
Rye 1/4 cup (42 g) 139 mg  332 mg  98 mg 
Wild Rice 1/4 cup (40 g) 173 mg  433 mg  121 mg 

Dairy
Food Serving Size P Per
Serving
P Per
100 g
P Per
100 cal
Casein Protein Powder 1 scoop (30 g) 396 mg  1321 mg  359 mg 
Cheddar Cheese 1 oz (28 g) 127 mg  455 mg  113 mg 
Cottage Cheese
(Nonfat)
1/2 cup (113 g) 215 mg  190 mg  264 mg 
Greek Yogurt
(Plain, Nonfat)
3/4 cup (170 g) 230 mg  135 mg  229 mg 
Milk
(Skim)
1 cup (240 g) 242 mg  101 mg  297 mg 
Mozzarella Cheese
(Low Moisture, Part-Skim)
1 oz (28 g) 150 mg  537 mg  177 mg 
Parmesan Cheese 1 oz (28 g) 178 mg  634 mg  148 mg 
Whey Protein Powder 1 scoop (30 g) 396 mg  1321 mg  336 mg 

Best Sources of Phosphorus
Per serving: Hemp Seeds - 462 mg (1 oz, 28 g)
Per 100 g: Hemp Seeds - 1,650 mg
Per 100 cal: Cuttlefish - 490 mg


TL;DR  Phosphorus might not get as much attention as calcium, but it’s just as essential for building strong bones and teeth. In fact, about 85% of the phosphorus in your body is found in your skeleton. While it's present in meat and dairy, you can also find it in plant foods like lentils, seeds, and nuts. Phosphorus helps your body create ATP, the molecule your cells use for energy. It also supports the repair of cells and tissues. The recommended daily intake is around 700 mg, regardless of gender.A deficiency (though rare) may cause weak muscles, bone pain, fatigue, and irregular breathing.

Benefits
  • Bone and teeth formation
  • Energy production (via ATP)
  • Cell and tissue repair
  • Muscle contraction
  • Nerve signaling
  • Kidney function
  • pH balance in the body


Sources (per 100 g)


Sources
  1. Nutrition Value
  2. FlatIcon
  3. Talon Fitness: Phosphorus - The True Nutrients
  4. Healthline: What are the Health Benefits of Phosphorus in Your Diet?
  5. NIH: Phosphorus
  6. Harvard Health: Phosphorus
  7. MedlinePlus: Phosphorus in diet
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