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Does Salt Affect Calcium?
Yes. A high sodium intake increases the calcium lost in urine, so eating less sodium means less calcium lost.[1]
Based on Linus Pauling Institute — Calcium · Updated October 10, 2026
High sodium increases calcium loss in urine[1]
A high sodium intake increases the calcium lost in urine, possibly because the two compete for reabsorption in the kidney; over years that may add to bone loss.
Eating less sodium means less calcium lost in urine.
Source [1]Calcium. Micronutrient Information Center, Linus Pauling Institute, Oregon State University. (lpi.oregonstate.edu)
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- How Does Potassium Balance Sodium?Potassium may help counter sodium’s effect on blood pressure, so potassium-rich foods are worth having alongside eating less salt.
- Should You Take Vitamin D With Calcium?Vitamin D is needed to absorb calcium, and bone needs both: low calcium and/or vitamin D contributes to osteoporosis.
- Does Caffeine Affect Calcium Absorption?Slightly. Caffeine reduces calcium absorption to a small extent; low vitamin D status reduces it more.
- Can You Take Iron and Calcium Together?Possibly. Calcium might interfere with iron absorption, so experts suggest taking calcium and iron supplements at different times of day.
Sources
- Calcium. Micronutrient Information Center, Linus Pauling Institute, Oregon State University. lpi.oregonstate.edu
This page is general information from the cited sources, not medical advice. If you take prescription medication, are pregnant, or manage a health condition, check supplement changes with a pharmacist or doctor.