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Calcium Citrate & Vitamin D

4.8
★ ★ ★ ★ ★
(960 ratings)
Calcium 630 mg
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Score82
A strong, clean calcium citrate and D3 formula whose full serving is best considered as divided intake.
How scoring works
Tablet
Quantity:250 Tablet(s) • (125 servings)
Goals:
Bone Health

Score 82

A strong, clean calcium citrate and D3 formula whose full serving is best considered as divided intake.
How scoring works
$18.19($0.14 per serving)
iHerb
$ 18.19
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Analysis

The citrate form is practical for users with lower stomach acid and does not require the same meal dependence as carbonate. Vitamin D3 supports absorption and gives the formula a clear bone-health rationale.

Six hundred thirty milligrams is a substantial calcium amount and may be better split rather than taken at once. The two-actives design is coherent and avoids token additions.

The tablets suit users seeking focused calcium and vitamin D rather than a comprehensive skeletal blend. Magnesium, vitamin K2, trace minerals, and protein-matrix nutrients remain outside the formula.

Who is it for
  • Adults seeking calcium citrate
  • Users with lower stomach acid
  • People filling a substantial calcium gap
Best for
  • Bone mineral support
  • Calcium plus vitamin D supplementation
  • Citrate-based calcium intake

Pros

  • Uses calcium citrate
  • Includes vitamin D3
  • Fully disclosed amounts
  • Focused two-active formula

Cons

  • Full serving may be better divided
  • No magnesium
  • No vitamin K2
  • No protein-matrix support

Warnings

  • Calcium can reduce absorption of levothyroxine, bisphosphonates, tetracycline antibiotics, and quinolone antibiotics; separate doses as directed.
  • People with high blood calcium or recurrent calcium-containing kidney stones should consider total calcium intake before use.

Nutrient quality

89 Highest impact

Calcium citrate is a well-absorbed form that does not depend heavily on stomach acid. The 630 mg serving is slightly above the usual absorption-focused amount and may work better when divided.

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Ingredient transparency

81 Highest impact

Active ingredients generally have stated amounts and no proprietary blend hides the doses. Missing other ingredients and complete intake directions leave important label details unresolved.

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Customer satisfaction

63 Moderate impact

The supplied average rating is strong and the rating volume provides a useful aggregate signal. No comment-level evidence is provided to assess recurring complaints or confirm how experience matches the intended purpose.

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Value for money

93 Highest impact

The active amount and formula quality support favorable serving value. The supplied formula is not inflated by obvious low-value extras.

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Goals

Bone Health
Bone Health
Impact
Highest effect
A Goal FitA- Strength of SupportB- CoverageA+ Formula Quality
Calcium · 630 mgVitamin D · 12.5 mcg

Calcium citrate and vitamin D3 directly address mineral supply and calcium absorption. The focused pair is highly relevant to bone health, though it lacks magnesium, vitamin K, and protein-matrix support.

Calcium is supplied at a substantial amount in an absorbable form, but taking the full serving at once may reduce fractional absorption. The simple formula is coherent, transparent, and free from unnecessary padding.

Study evidence
Calcium Supportive 144 studies

Ingredients

IngredientAmount per serving
Vitamin D (Cholecalciferol)
 12.5 mcg
Calcium (Calcium Citrate)
 630 mg
Adults 18–50
Report overview
Calcium (Calcium Citrate) · 630 mg OverallScore80
A- Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyA+ Value

The dedicated supplement clearly uses well-absorbed calcium citrate. The 630 mg serving may absorb less efficiently when taken all at once. The serving cost is very low for a clearly identified citrate source. Calcium can reduce absorption of levothyroxine and tetracycline or quinolone antibiotics, so users should separate doses according to their prescription directions.

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88 Performance

Calcium Hydroxyapatite Caps

NOW
<p>Hydroxyapatite supplies a practical calcium amount with naturally paired phosphorus and clear dosing. It preserves a well-absorbed calcium approach while improving either serving flexibility or practical value over the original.</p>
85 Performance

Cal/Mag 500 mg/250 mg

NaturesPlus
<p>Chelated calcium and magnesium provide a balanced mineral formula with strong form quality. It adds magnesium and other bone cofactors beyond the original citrate-only approach, with some trade-off in formula simplicity.</p>
82 Performance

Ultra BoneUp

Jarrow Formulas
<p>Calcium, vitamin D3, magnesium, MK-7, silicon, boron, and cartilage collagen cover several bone pathways. It adds magnesium and other bone cofactors beyond the original citrate-only approach, with some trade-off in formula simplicity. Magnesium oxide is a weakness, and vitamin K2 needs caution with warfarin-type medicines.</p>
84 Budget

600 Calcium Supplement

21st Century
<p>A straightforward 600 mg calcium carbonate tablet provides a focused serving without unrelated actives. It costs less per serving, though carbonate is less flexible than the original citrate and works best with food.</p>
85 Budget

Calcium Carbonate

NOW
<p>A pure calcium carbonate powder supplies a substantial dose with simple active disclosure. It costs less per serving, though carbonate is less flexible than the original citrate and works best with food.</p>
84 Budget

Calcium 600 with Vitamin D3

Nature's Bounty
<p>Calcium carbonate and vitamin D3 provide a direct bone-support pairing in a focused formula. It costs less per serving, though carbonate is less flexible than the original citrate and works best with food.</p>
88 Value

Calcium Citrate Pure Powder

NOW
<p>Calcium citrate powder provides a substantial, well-absorbed dose with flexible use and strong serving value. It preserves a well-absorbed calcium approach while improving either serving flexibility or practical value over the original. It does not include vitamin D, vitamin K, or magnesium.</p>
82 Value

Calcium Citrate

Nature's Way
<p>Citrate and malate improve absorption flexibility within a practical mixed-calcium serving at strong value. It preserves a well-absorbed calcium approach while improving either serving flexibility or practical value over the original.</p>
85 Value

600+D3

21st Century
<p>A reasonably sized calcium carbonate serving with vitamin D3 provides focused bone support at very low routine cost. It improves cost or cofactor coverage, though carbonate is less flexible than the original citrate and works best with food. Calcium should be separated from levothyroxine and tetracycline or quinolone antibiotics.</p>
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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Calcium supplementation during pregnancy and maternal and offspring bone health: a systematic review and meta-analysis.
    Tihtonen K; Korhonen P; Isojärvi J; Ojala R; Ashorn U; Ashorn P; Tammela O · Annals of the New York Academy of Sciences · 2022
    Meta-analysis1,566 participants7 studies pooledBone Health forCalcium
  2. Calcium supplementation and bone mineral density in postmenopausal women using estrogen replacement therapy.
    Haines CJ; Chung TK; Leung PC; Hsu SY; Leung DH · Bone · 1995
    Randomized trialBone Health forCalcium
  3. Calcium supplementation provides an extended window of opportunity for bone mass accretion after menarche.
    Rozen GS; Rennert G; Dodiuk-Gad RP; Rennert HS; Ish-Shalom N; Diab G; Raz B; Ish-Shalom S · The American journal of clinical nutrition · 2003
    Randomized trial100 participantsBone Health forCalcium
  4. Relationship between bone mineral density changes and risk of fractures among patients receiving calcium with or without vitamin D supplementation: a meta-regression.
    Rabenda V; Bruyère O; Reginster JY · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2011
    Meta-analysis47,365 participants15 studies pooledBone Health forCalcium
  5. Treatment with alendronate plus calcium, alendronate alone, or calcium alone for postmenopausal low bone mineral density.
    Bonnick S; Broy S; Kaiser F; Teutsch C; Rosenberg E; DeLucca P; Melton M · Current medical research and opinion · 2007
    Randomized trial701 participantsBone Health forCalcium
  6. What is the impact of daily oral supplementation of vitamin D3 (cholecalciferol) plus calcium on the incidence of hip fracture in older people? A systematic review and meta-analysis.
    Manoj P; Derwin R; George S · International journal of older people nursing · 2023
    Meta-analysis12,620 participants7 studies pooledBone Health forCalcium
  7. Calcium supplementation prevents seasonal bone loss and changes in biochemical markers of bone turnover in elderly New England women: a randomized placebo-controlled trial.
    Storm D; Eslin R; Porter ES; Musgrave K; Vereault D; Patton C; Kessenich C; Mohan S; Chen T; Holick MF; Rosen CJ · The Journal of clinical endocrinology and metabolism · 1998
    Randomized trial60 participantsBone Health forCalcium
  8. The effects of calcium supplementation (milk powder or tablets) and exercise on bone density in postmenopausal women.
    Prince R; Devine A; Dick I; Criddle A; Kerr D; Kent N; Price R; Randell A · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 1995
    Randomized trial168 participantsBone Health forCalcium
  9. The efficacy of calcium supplementation alone in elderly Thai women over a 2-year period: a randomized controlled trial.
    Rajatanavin R; Chailurkit L; Saetung S; Thakkinstian A; Nimitphong H · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2014
    Randomized trial404 participantsBone Health forCalcium
  10. Calcium-enriched foods and bone mass growth in prepubertal girls: a randomized, double-blind, placebo-controlled trial.
    Bonjour JP; Carrie AL; Ferrari S; Clavien H; Slosman D; Theintz G; Rizzoli R · The Journal of clinical investigation · 1997
    Randomized trial149 participantsBone Health forCalcium