Phosphorus
What it is
The second most abundant mineral in the body, essential for bone formation, ATP production, and DNA synthesis. Dietary deficiency is rare in healthy adults because phosphorus is abundant in dairy, meat, fish, and processed foods — but clinically meaningful depletion is common after bariatric surgery, with prolonged antacid or PPI use, and in severe malnutrition or refeeding syndrome. Excess calcium supplements impair absorption, and chronic kidney disease reverses the concern entirely — restriction, not supplementation, is the priority.
Dose
700 mg/day RDA from food or supplement; deficiency most common after bariatric surgery or long-term antacid use
Time of day & tips
Take with food and water. Space 2 hours from calcium supplements — they compete for absorption. Antacid users should monitor phosphorus levels with routine bloodwork.
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