Is Calcium Citrate and Caltrate the Same? A Deep Dive into Calcium Supplements
No, calcium citrate is not the same as Caltrate. Caltrate is a brand using calcium carbonate, a calcium form with its own properties. Understanding the differences is important for bone health.
The Chemical Distinction: Carbonate vs. Citrate
The difference lies in the chemical composition. Calcium in supplements is bound to another substance.
- Calcium Carbonate (Caltrate): It is the most common form with 40% elemental calcium by weight. It comes from natural sources like oyster shells.
- Calcium Citrate: It is a calcium salt of citric acid and has 21% elemental calcium by weight. More tablets may be needed to get the same amount as carbonate supplements.
Absorption and Timing
Absorption is a key difference. This is vital for those with specific health or dietary needs.
- Calcium Carbonate (Caltrate): Requires stomach acid and is best with food. Food helps the stomach break down the compound.
- Calcium Citrate: Does not need stomach acid and can be taken with or without food. It is a good choice for people with low stomach acid (common in older adults or those on acid-reducing medications).
Elemental Calcium Content and Pill Size
Since calcium carbonate has more elemental calcium, fewer tablets are needed. Calcium citrate usually needs more tablets.
Potential Side Effects
Both are generally well-tolerated but can have different effects.
- Calcium Carbonate (Caltrate): May cause constipation, bloating, and gas.
- Calcium Citrate: Often gentler on digestion and less likely to cause constipation. It's a good alternative for those with digestive discomfort.
Comparison Table: Calcium Citrate vs. Caltrate (Calcium Carbonate)
| Feature | Calcium Citrate | Caltrate (Calcium Carbonate) |
|---|---|---|
| Elemental Calcium Content | Approx. 21% by weight | Approx. 40% by weight |
| Absorption | Can be taken with or without food | Must be taken with food for best absorption |
| Stomach Acid Required? | No | Yes |
| Best for Individuals with Low Stomach Acid? | Yes | No |
| Tablet Size/Dosage | Bulkier; may require more tablets | More concentrated; fewer or smaller tablets |
| Potential GI Side Effects | Less likely to cause constipation/bloating | More likely to cause constipation/bloating |
| Cost | Generally more expensive | Typically less expensive |
| Primary Goal | General calcium supplementation | General supplementation; also used as an antacid |
Other Factors to Consider
Many supplements, including Caltrate, are formulated with vitamin D3 to enhance calcium absorption, as vitamin D is essential for the body to properly utilize calcium. Some Caltrate versions include magnesium, zinc, and manganese for bone support. Calcium supplements are most effective in divided doses of no more than 500mg at a time.
Conclusion: The Right Choice Depends on Your Needs
Caltrate is a brand using calcium carbonate, which is different from calcium citrate. The best choice depends on your digestive health, stomach acid levels, budget, and preference for pill size. Calcium citrate is better for those with low stomach acid or a tendency toward constipation. For those with normal stomach acidity, calcium carbonate in Caltrate may be preferable. Always consult a healthcare provider to determine the best calcium supplement.
Frequently Asked Questions
Does Caltrate contain calcium citrate?
No, most Caltrate products contain calcium carbonate, a different form of calcium with different absorption properties.
Which is better absorbed, calcium citrate or Caltrate?
Calcium citrate is more readily absorbed by the body and does not require stomach acid, making it a better option for people with low stomach acid. Caltrate, which contains calcium carbonate, is best absorbed when taken with food.
Can I take calcium citrate and Caltrate together?
It is generally not necessary to take both simultaneously, as they both provide calcium. Consulting a healthcare provider is recommended to determine the right supplement and dosage for your needs.
Why would someone choose Caltrate over calcium citrate?
Individuals might choose Caltrate because calcium carbonate is more concentrated, meaning fewer or smaller pills are needed to get the same amount of elemental calcium, and it is typically less expensive than calcium citrate.
Is calcium citrate better for people with low stomach acid?
Yes, calcium citrate is generally recommended for people with low stomach acid or those taking acid-reducing medications, as its absorption is not dependent on stomach acid.
Which is less likely to cause constipation, calcium citrate or Caltrate?
Calcium citrate is less likely to cause constipation compared to calcium carbonate (the form in Caltrate), which can cause this side effect in some individuals.
Does vitamin D affect calcium absorption from Caltrate or calcium citrate?
Yes, vitamin D is crucial for the absorption of all forms of calcium. Both Caltrate and many calcium citrate supplements often include vitamin D to maximize absorption.
