Meta Information
ID:calcium-citrate
Name:
Schema Version:AIM-2.0
Interactions
Target id:
/class/chelating-antibiotics
Target name:
Tetracycline & Quinolone Antibiotics
Severity:
major
Interaction type:
diminishing
Nature:
temporal
Temporal spacing:
Hours before target:
2
Hours after target:
6
Description:
Calcium binds (chelates) to tetracycline and quinolone antibiotics in the gut, forming an insoluble complex that prevents the antibiotic from being absorbed and rendering it ineffective.
Actionable advice:
Take these antibiotics at least 2 hours before or 6 hours after taking calcium.
Target id:
/intervention/levothyroxine_systemic_disease
Target name:
Levothyroxine (Thyroid Hormone)
Severity:
major
Interaction type:
diminishing
Nature:
temporal
Temporal spacing:
Hours before target:
4
Hours after target:
4
Description:
Calcium can bind to levothyroxine in the gastrointestinal tract, significantly reducing its absorption and therapeutic effect.
Actionable advice:
Separate doses of levothyroxine and calcium by at least 4 hours.
Target id:
/intervention/bisphosphonates
Target name:
Bisphosphonates (e.g., Alendronate)
Severity:
major
Interaction type:
diminishing
Nature:
temporal
Temporal spacing:
Hours before target:
2
Hours after target:
2
Description:
Calcium, like food, severely impairs the absorption of oral bisphosphonates, which can make them ineffective for treating osteoporosis.
Actionable advice:
Take bisphosphonates on an empty stomach and wait at least 2 hours before taking calcium.
Target id:
/intervention/iron-bisglycinate
Target name:
Iron Supplements
Severity:
major
Interaction type:
diminishing
Nature:
temporal
Temporal spacing:
Hours before target:
2
Hours after target:
4
Description:
Calcium competes with and significantly inhibits the intestinal absorption of both heme and non-heme iron.
Actionable advice:
Separate calcium and iron supplements by at least 4 hours.
Target id:
/class/diuretics
Target name:
Thiazide Diuretics (e.g., HCTZ)
Severity:
major
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
Thiazide diuretics decrease the amount of calcium excreted in the urine, which when combined with calcium supplements can lead to dangerously high blood calcium levels (hypercalcemia).
Actionable advice:
Avoid high-dose calcium supplements or use only under strict medical supervision while taking thiazide diuretics.
Target id:
/intervention/digoxin
Target name:
Digoxin
Severity:
major
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
High levels of calcium in the blood (hypercalcemia) increase the risk of serious cardiac side effects from digoxin, including arrhythmias.
Actionable advice:
Avoid calcium supplements while taking digoxin unless specifically approved and monitored by your doctor.
Target id:
/condition/renal-impairment
Target name:
Kidney Disease / Renal Impairment
Severity:
major
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
Impaired kidneys cannot effectively excrete excess calcium, leading to a high risk of hypercalcemia, soft tissue calcification, and worsening kidney damage.
Actionable advice:
Do not take calcium supplements if you have significant kidney disease, except under the direct guidance of a nephrologist.
Target id:
/intervention/vitamin_d3_systemic_healthspan
Target name:
Vitamin D3
Severity:
major
Interaction type:
requirement
Nature:
absolute
Temporal spacing:
null
Description:
Vitamin D is essential for producing the hormone calcitriol, which is required for the active transport and absorption of calcium from the intestine.
Actionable advice:
Ensure adequate Vitamin D intake through sun, diet, or supplementation for calcium to be effective.
Target id:
/procedure/high-dose-bolus
Target name:
Single Doses >500mg Elemental Calcium
Severity:
major
Interaction type:
diminishing
Nature:
absolute
Temporal spacing:
null
Description:
The body's capacity to absorb calcium is saturable; absorption efficiency drops sharply with single doses exceeding 500-600 mg of elemental calcium.
Actionable advice:
Split your total daily calcium dose into smaller doses of 500mg or less, taken several hours apart.
Target id:
/intervention/zinc
Target name:
Zinc Supplements
Severity:
moderate
Interaction type:
diminishing
Nature:
temporal
Temporal spacing:
Hours before target:
2
Hours after target:
2
Description:
High doses of calcium can compete with zinc for absorption pathways in the small intestine, reducing the bioavailability of zinc.
Actionable advice:
Separate high-dose calcium from zinc supplements by at least 2 hours.
Target id:
/intervention/magnesium
Target name:
Magnesium Supplements
Severity:
moderate
Interaction type:
diminishing
Nature:
temporal
Temporal spacing:
Hours before target:
2
Hours after target:
2
Description:
High doses of calcium and magnesium compete for the same intestinal absorption channels, which can reduce the uptake of both minerals when taken together.
Actionable advice:
Separate high-dose calcium and magnesium supplements by at least 2 hours.
Target id:
/intervention/vitamin-k2
Target name:
Vitamin K2 (Menaquinone)
Severity:
moderate
Interaction type:
synergistic
Nature:
absolute
Temporal spacing:
null
Description:
Vitamin K2 activates proteins that help direct calcium into bones and teeth and prevent its deposition in arteries and soft tissues, promoting both skeletal and cardiovascular health.
Actionable advice:
Consider taking Vitamin K2 alongside calcium and Vitamin D to support proper calcium utilization.
Target id:
/dietary/phytate-rich-foods
Target name:
Foods High in Oxalates or Phytates
Severity:
moderate
Interaction type:
diminishing
Nature:
temporal
Temporal spacing:
Hours before target:
2
Hours after target:
2
Description:
Oxalates (in spinach, rhubarb) and phytates (in whole grains, legumes) can bind to calcium in the gut, forming insoluble salts and reducing calcium absorption from supplements taken with these foods.
Actionable advice:
For maximal absorption, separate calcium supplements from meals very high in oxalates or phytates by 2 hours.
Target id:
/condition/history-of-kidney-stones
Target name:
History of Kidney Stones
Severity:
moderate
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
While citrate can help prevent stone formation, high total calcium intake can increase urinary calcium excretion and may raise the risk of calcium oxalate stones in susceptible individuals.
Actionable advice:
Consult your doctor before taking calcium supplements if you have a history of kidney stones.
Target id:
/intervention/strontium
Target name:
Strontium Supplements
Severity:
moderate
Interaction type:
diminishing
Nature:
temporal
Temporal spacing:
Hours before target:
2
Hours after target:
2
Description:
Strontium and calcium are chemically similar and compete for the same absorption mechanisms in the gut, reducing the uptake of both minerals.
Actionable advice:
Separate strontium and calcium supplements by at least 2-4 hours.
Target id:
/dietary/meal
Target name:
Any Caloric Meal
Severity:
minor
Interaction type:
synergistic
Nature:
temporal
Temporal spacing:
Hours before target:
0
Hours after target:
0
Description:
While calcium citrate does not require stomach acid for absorption, taking it with food can improve gastrointestinal tolerance and may slightly enhance absorption.
Actionable advice:
Take with a meal or snack to minimize potential stomach upset.
Target id:
/class/proton-pump-inhibitors
Target name:
Proton Pump Inhibitors (PPIs)
Severity:
minor
Interaction type:
synergistic
Nature:
absolute
Temporal spacing:
null
Description:
Unlike calcium carbonate, calcium citrate does not require stomach acid for absorption, making it a preferred form for individuals on acid-suppressing medications like PPIs.
Actionable advice:
Calcium citrate is an effective choice if you are taking a PPI; no timing adjustments are needed.
Target id:
/class/calcium-channel-blockers
Target name:
Calcium Channel Blockers (CCBs)
Severity:
minor
Interaction type:
adverse
Nature:
absolute
Temporal spacing:
null
Description:
Theoretically, high doses of supplemental calcium could oppose the therapeutic effect of CCBs, which work by blocking calcium channels, but this is not considered clinically significant at standard doses.
Actionable advice:
Use standard doses of calcium as directed; no special precautions are typically needed with CCBs.