Calcium Supplements Guide (2026): Evidence-Based Comparisons
Calcium forms (citrate vs carbonate), absorption with and without stomach acid, and who needs what.
Daily Dose of Calcium, Vitamin D & K2: What to Take Together
How much calcium, vitamin D3, and K2 to take daily: 1,000-1,200mg calcium (the gap only), 1,000-2,000 IU D3, and 90-200mcg MK-7 K2, taken with a fatty meal.
Best Calcium Supplement (2026): Form, Dose & the Food-First Truth
The best calcium supplements ranked by form and cost — plus the honest context: get calcium from food first, supplements only fill the gap, and high-dose calcium supplements carry a debated heart risk.
Calcium Citrate vs Carbonate: Why the Form You Take Matters (2026)
Calcium carbonate requires stomach acid to absorb. If you take a PPI, are over 65, or take calcium without food, carbonate is practically useless. Citrate absorbs 10x better without acid.
Calcium for Bones & Osteoporosis (2026): Does It Prevent Fractures?
The honest fracture evidence: calcium plus vitamin D helps most in deficient and older institutionalized people, but did not significantly cut fractures in healthy community-dwelling adults. Who benefits, the dose, and why exercise matters more than you think.
Best Calcium for Women Over 50 (2026): Dose, Form & the Food-First Rule
After menopause women lose bone faster and need 1,200mg calcium a day. How much should come from a supplement vs food, why calcium citrate suits older adults, and the heart-risk caution that means not overdoing it.
Compare Calcium Citrate Products by Cost Per Day
If you're ready to buy, here's how the calcium citrate products we track and verify compare on cost per day.
| Product | Dose/Serving | Servings | Price | Cost/Day | Certification | Buy |
|---|---|---|---|---|---|---|
| Citracal Maximum Plus Calcium Citrate with Vitamin D3 Best Value | 650mg | 90 | $14.96 | $0.17 | None | Buy on Amazon |
| Solgar Calcium Citrate with Vitamin D3 Budget Pick | 1000mg | 60 | $20.85 | $0.18 | None | Buy on Amazon |
| NOW Foods Calcium Citrate with Minerals & Vitamin D | 600mg | 125 | $25.72 | $0.21 | None | Buy on Amazon |
| Citracal Petites Calcium Citrate with Vitamin D3 | 400mg | 100 | $10.92 | $0.22 | None | Buy on Amazon |
About our data
Every comparison uses clinical evidence from PubMed systematic reviews, product label data from the NIH Dietary Supplement Label Database, and third-party certifications (USP, NSF). Products are ranked by cost per clinically-effective dose. See our methodology and editorial standards.