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Calcium Citrate +D3 Maximum

21st Century
4.8
★ ★ ★ ★ ★
(20857 ratings)
Calcium 630 mg
Product Image
Score98

A premium-absorption calcium citrate and D3 tablet designed for maximum tolerance and efficacy.

How scoring works
Quantity:75 Tablet(s) • (37 servings)
Goals:
Bone Health

Score 98

A premium-absorption calcium citrate and D3 tablet designed for maximum tolerance and efficacy.

How scoring works

Also available as

2 options
400mg • 200 Tablet(s) servings Calcium 400 mg • 200 Tablet(s) • 100 servings $10.99 ($0.10 per serving) 120 servings Calcium 630 mg • 120 Tablet(s) • 60 servings $6.99 ($0.11 per serving)
$6.49($0.17 per serving)
iHerb
$ 6.49
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Analysis

Calcium citrate is widely considered the better-absorbed form compared to carbonate, especially as we age and stomach acid naturally decreases. This formula includes 630mg of citrate along with vitamin D3 to maximize mineral transport.

Because it is a citrate-based supplement, it is much less likely to cause the gas and constipation often associated with cheaper bone health products. It is a thoughtful formulation for maintaining skeletal integrity efficiently.

Pros

  • Highly bioavailable citrate form
  • Gentle on the stomach
  • Includes vitamin D3
  • No food required for absorption

Cons

  • Lacks magnesium
  • Tablet size is somewhat large
  • Requires two tablets for full dose

Warnings

  • Take with plenty of water
  • Keep in a cool, dry place

Nutrient quality

97 Highest impact

Superior bioavailability of the citrate form ensures efficient mineral utilization and gastrointestinal comfort. Synergistic inclusion of vitamin D supports essential pathways for calcium transport.

Ingredient transparency

99 Highest impact

All active ingredients and their respective milligram yields are clearly disclosed on the labeling. Consumer transparency is supported by clear intake instructions and disclosure of all formula components.

Customer satisfaction

98 Highest impact

Exceptional average ratings across a massive user base indicate superior product quality. Feedback confirms the citrate form is effective and well-tolerated for long-term mineral support.

Value for money

99 Highest impact

Pricing is very competitive for a high-quality mineral and vitamin supplement using the citrate form. Exceptional value is provided by the combination of high bioavailability and affordable cost.

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Goals

Bone Health
Impact
Highest effect
A Goal FitA Strength of SupportC CoverageA Formula Quality

Calcium citrate provides a highly bioavailable structural mineral to maintain bone mineral density and skeletal strength. Vitamin D3 is included to ensure efficient intestinal absorption and mineral transport to the bone matrix.

This selection is superior to standard carbonate forms due to its high solubility and lack of requirement for stomach acid. However, the formula lacks foundational magnesium and signaling cofactors like vitamin K2, which are necessary for full skeletal synergy.

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Ingredients

IngredientAmount per serving
Vitamin D3 (Cholecalciferol)
 13 mcg
Calcium (Calcium Citrate)
 630 mg
Gluten Free Adults 18–50
Report overview
Calcium (Calcium Citrate) · 630 mg OverallScore74
A- Active Ingredient Quality & BioavailabilityD Dose, Safety & Label TransparencyA+ Value
These calcium citrate tablets provide a high-bioavailability mineral source for those seeking the best possible skeletal absorption. The formula is designed to be gentle on the digestive system while providing a robust daily dose.
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