Phosphorus
Supports bones, cell membranes, and the energy molecule ATP.
Why it matters
Phosphorus helps build bones and teeth, forms part of cell membranes, and is essential to ATP, the molecule your cells use for energy. It also helps with acid-base balance.
- Supports bones and teeth.
- Helps build phospholipids in cell membranes.
- Plays a central role in ATP and energy transfer.
If intake is too low
Phosphorus deficiency is uncommon, but when it happens it can affect bones, muscles, and general energy. Deficiency is more likely with severe malnutrition, certain medications, or major medical problems.
- Bone pain or weak bones.
- Muscle weakness and fatigue.
- Loss of appetite, irritability, or confusion in more severe deficiency.
If intake is too high
Too much phosphorus, especially from additives or in the setting of kidney disease, can upset calcium balance and strain bone and kidney health.
- Can contribute to abnormal calcium-phosphorus balance.
- Higher concern in chronic kidney disease.
- Very high intake from processed foods and supplements is not automatically harmless.
Adult upper limit: 3,000-4,000 mg/day
The adult upper limit is 4,000 mg/day for ages 19-70 and 3,000 mg/day for adults over 70.
Common food sources
Phosphorus is common in protein-rich foods and is also added to many processed products.
- Dairy foods, meat, poultry, and fish
- Beans, nuts, and whole grains
- Processed foods and colas with phosphate additives
Who may need closer attention
Low intake is uncommon, but poor balance becomes more relevant when kidneys do not clear phosphorus well.
- People with chronic kidney disease
- People with severe undernutrition or refeeding issues
- Anyone using large amounts of processed foods plus phosphorus-containing supplements
Use extra caution if
Small details change the risk picture with nutrients more than most people expect.
You have chronic kidney disease or use products with a lot of phosphate additives. The problem with phosphorus is often not deficiency, but imbalance.
Supplement and label notes
Useful context when this nutrient shows up across more than one product.
- Phosphate additives are absorbed very efficiently and can raise intake quickly.
- Most people get plenty of phosphorus from food without trying.
- A label can look modest while processed food intake quietly drives phosphorus high.
Daily Value targets in SuppMap
These are the same label-style Daily Value targets used in the app.
Official references
These pages were used to draft the summaries on this guide.
Educational only. These pages are not a diagnosis or a substitute for personal medical care.
More guides
Keep moving through the rest of the Daily Value chart from here.