Calcium content
Carbonate40%
Citrate21%
Side-by-side analysis
Calcium Carbonate vs Calcium Citrate
Both calcium forms support bone health, but absorption and digestion profiles differ significantly.
Detailed Comparison
| Feature | Carbonate | Citrate |
|---|---|---|
| Calcium content | 40% | 21% |
| Requires food | Yes (acid) | No |
| Absorption | Good with food | Good anytime |
| Cost | Very affordable | Higher cost |
| Constipation risk | Moderate | Low |
| Best for | Meal timing | Anytime dosing |
Requires food
CarbonateYes (acid)
CitrateNo
Absorption
CarbonateGood with food
CitrateGood anytime
Cost
CarbonateVery affordable
CitrateHigher cost
Constipation risk
CarbonateModerate
CitrateLow
Best for
CarbonateMeal timing
CitrateAnytime dosing
Key Benefits
Calcium Carbonate
- +Highest elemental calcium
- +Most affordable option
- +Well researched
- +Effective with meals
- +Minimal fillers
Calcium Citrate
- +Absorbs without food
- +Gentler on digestion
- +No constipation
- +Easier dosing
- +Better for low stomach acid
Dosage Comparison
Dosage Guidelines
Calcium Carbonate
—Typical: 500-1000mg daily
—Best time: With meals
—Split dose: For absorption >500mg
Calcium Citrate
—Typical: 750-1000mg daily
—Best time: Any time, with or without food
—Advantage: No splitting needed
Safety & Side Effects
Digestive Effects
Carbonate
⚠️ Digestion concerns
—Constipation common
—Bloating possible
—Needs food for absorption
Citrate
✅ Gentle option
—No constipation
—Minimal bloating
—Easier on stomach
Our Recommendation
Best Choice
Carbonate if:
—Budget is priority
—Normal stomach acid
—Take with meals only
Citrate if:
—Digestion sensitive
—Low stomach acid
—Flexible dosing needed