Most Canadians don't get enough calcium from food alone. But picking a calcium supplement off the shelf is more complicated than it looks — the form matters, the dose matters, and the timing matters. Here's what you actually need to know.
Before buying anything, it's worth figuring out how much calcium you're getting from food. The average Canadian adult gets around 700–800 mg of calcium per day from diet. The recommended daily intake is 1,000 mg for adults under 50, and 1,200 mg for women over 50 and men over 70. That gap — somewhere between 200 and 500 mg per day — is where supplements are genuinely useful.
Supplements aren't always necessary. If you eat dairy regularly, canned fish with bones (sardines, salmon), and calcium-fortified foods, you may be close to your target. Use a simple food diary for a few days before defaulting to a supplement. See our guide to calcium-rich Canadian foods for a breakdown by serving.
These are the two dominant forms of calcium supplements sold in Canada, and they're meaningfully different.
Calcium carbonate (Caltrate, Tums, most store-brand supplements) contains about 40% elemental calcium by weight — it's the most concentrated form, so you swallow fewer pills to get your dose. It's inexpensive and widely available. The catch: it requires stomach acid to dissolve properly. That means it must be taken with food. If you take it on an empty stomach, absorption is poor.
People on proton pump inhibitors (PPIs like Nexium, Losec, or Pantoloc), H2 blockers, or those with achlorhydria (low stomach acid) should avoid calcium carbonate — their stomach acid is already suppressed and the supplement won't dissolve well.
Calcium citrate (Citracal, Slow-Cal) contains about 21% elemental calcium — you need more pills for the same dose, and it's typically more expensive. The advantage: it doesn't require stomach acid. It can be taken with or without food, which makes it more flexible and better tolerated by people with digestive sensitivity. It's the preferred form for anyone over 65, anyone on acid-reducing medications, and anyone with IBS or digestive issues.
| Feature | Calcium Carbonate | Calcium Citrate |
|---|---|---|
| Elemental calcium | 40% | 21% |
| Must take with food? | Yes | No |
| Works with PPIs? | Poorly | Yes |
| Typical cost (Canada) | Lower | Higher |
| Best for | Adults under 65 with normal digestion | Seniors, people on acid meds, digestive issues |
Health Canada and Osteoporosis Canada recommend the following daily calcium intakes (total from food + supplements combined):
| Life Stage | Daily Calcium Target | Notes |
|---|---|---|
| Adults 19–50 | 1,000 mg | Includes pregnant/breastfeeding women |
| Women 51–70 | 1,200 mg | Post-menopause increases need |
| Men 51–70 | 1,000 mg | |
| Adults 71+ | 1,200 mg | Both sexes |
Important: these are total daily targets from all sources. If your diet provides 800 mg, you only need to supplement 200–400 mg. Taking more than you need doesn't strengthen bones further and may have downsides (see below).
Your body can only absorb roughly 500 mg of calcium at one time. If you take a 1,000 mg tablet, you absorb about half of it. This is one of the most common and easily fixed calcium mistakes Canadians make.
If you need to supplement 600–1,000 mg per day, split it into two doses: one with breakfast and one with dinner. This effectively doubles your absorption with no extra cost and no extra pills — just better timing. You can set a phone reminder if you forget the second dose.
Calcium supplements interact with several common medications. Tell your doctor or pharmacist what you're taking before starting calcium supplements:
Calcium supplements are sold at every major Canadian pharmacy, grocery chain, and warehouse store. Here are the main options you'll encounter:
The Life Brand calcium supplements are competitively priced and reliable. Caltrate 600+D (calcium carbonate + vitamin D3) is one of the top-selling options at around $20–25 CAD for 160 tablets. Citracal (calcium citrate) is also stocked at most large Shoppers locations, typically $22–28 for 200 tablets.
Costco's Kirkland Signature Calcium Citrate + D3 + Magnesium is an excellent value — typically around $18–22 CAD for 500 tablets. The combination formula (calcium + D3 + magnesium) is well-formulated and frequently recommended by Canadian pharmacists. Costco also carries Nature Made Calcium 600 mg with D3 in bulk at competitive prices.
Jamieson (a well-regarded Canadian brand) sells calcium citrate and carbonate options at around $15–22 CAD, with Prime shipping. NOW Foods calcium supplements are popular on Amazon.ca — good quality, third-party tested, and typically 20–30% cheaper than pharmacy retail prices.
You may have seen headlines linking calcium supplements to cardiovascular risk. The evidence here is genuinely nuanced and has evolved significantly. The concern originated from studies suggesting supplemental calcium (not dietary calcium) might increase arterial calcification. More recent and comprehensive reviews — including a 2021 meta-analysis in the BMJ — have not found a significant cardiovascular risk from calcium supplementation at recommended doses when vitamin D and K2 status are adequate.
The practical take: stick to the recommended dose (don't supplement far more than you need), ensure you have adequate vitamin D, and consider adding K2 if you're supplementing long-term. Calcium from food has never shown this concern. See our vitamin K2 guide and our guide on taking calcium and vitamin D together for more detail.