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Calcium + Vitamin D

4.6
★ ★ ★ ★ ★
(1269 ratings)
Calcium 1020 mg
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Score73

A useful citrate-carbonate blend with D3 offers strong support, but the large dose should be divided and the duplicated form record needs clarification.

How scoring works
Tablet
Quantity:250 Tablet(s) • (83 servings)
Goals:
Bone Health

Score 73

A useful citrate-carbonate blend with D3 offers strong support, but the large dose should be divided and the duplicated form record needs clarification.

How scoring works
$23.98($0.28 per serving)
iHerb
$ 23.98
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Analysis

Citrate offers flexible absorption, while carbonate provides a compact elemental calcium source. Vitamin D3 supports calcium use and gives the formula a coherent bone-health purpose.

The large daily amount is better divided when the directions allow, and taking it with food supports the carbonate portion. The label record assigns the full amount to both calcium forms, so shoppers should confirm whether it describes a blend total rather than two additive doses.

The long supply supports practical use, but calcium intake still needs to be matched to diet. No magnesium or vitamin K broadens the bone formula.

Who is it for
  • Adults with a substantial calcium gap
  • People wanting citrate plus carbonate
  • Users able to divide the daily dose
Best for
  • Bone-mineral support
  • Calcium plus vitamin D3
  • Long-term divided supplementation

Pros

  • Mixed calcium forms
  • Vitamin D3 included
  • Substantial calcium amount
  • Long supply

Cons

  • Large amount for one sitting
  • Calcium form totals are ambiguous
  • No magnesium or vitamin K
  • Carbonate portion works best with food

Warnings

  • Confirm the total calcium on the package because the supplied record repeats the same amount for citrate and carbonate.
  • Separate calcium from levothyroxine and certain antibiotics according to medication guidance.
  • Kidney stones, high blood calcium, or significant kidney disease require medical guidance.

Nutrient quality

74 High impact

The mixed calcium forms and vitamin D3 provide a useful bone-focused pairing. The large calcium amount reduces single-dose efficiency and the form breakdown is unclear.

Ingredient transparency

63 Moderate impact

Vitamin D is clear, but the repeated full calcium amount under two forms makes the mineral breakdown ambiguous. Intake directions and non-active tablet ingredients are not included.

Customer satisfaction

69 High impact

The aggregate rating is strong and has a useful response base. No review text is supplied, so repeated complaints and purpose-specific experiences cannot be verified.

Value for money

90 Highest impact

Two calcium forms and vitamin D support good practical value. Label ambiguity and the oversized serving modestly weaken the otherwise competitive cost.

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Goals

Bone Health
Bone Health
Impact
Highest effect
A+ Goal FitB- Strength of SupportC CoverageA+ Formula Quality
Calcium · 1020 mgVitamin D · 25 mcg

Calcium at 1020 mg provides structural material, while vitamin D3 supports its absorption. The pairing is strongly supported for bone maintenance when dietary intake or vitamin D status is inadequate.

mixed calcium carbonate and citrate is clearly disclosed, and the 25 mcg vitamin D3 amount provides useful cofactor support. The large calcium serving is likely to absorb better if divided rather than taken all at once.

Study evidence
Calcium Supportive 144 studies
Vitamin D Supportive 202 studies

Ingredients

IngredientAmount per serving
Vitamin D (Cholecalciferol)
 25 mcg
Calcium (Calcium Carbonate, Calcium Citrate)
 1020 mg
Adults 18–50
Report overview
Calcium (Calcium Carbonate, Calcium Citrate) · 1020 mg OverallScore73
A- Active Ingredient Quality & BioavailabilityD Dose, Safety & Label TransparencyA+ Value

A citrate and carbonate blend offers better absorption potential than carbonate alone. The mineral amount is clearly stated, but the large single serving exceeds the efficient uptake range. Very low cost supports strong value if intake is divided.

View ingredientView products
Loading alternative details
88 Performance

Calcium Hydroxyapatite Caps

NOW
<p>Hydroxyapatite supplies a practical calcium amount with naturally paired phosphorus and clear dosing. Clearer forms and stronger calcium focus improve practical usefulness compared with the original formula.</p>
85 Performance

Cal/Mag 500 mg/250 mg

NaturesPlus
<p>Chelated calcium and magnesium provide a balanced mineral formula with strong form quality. Broader mineral and vitamin coverage gives it more bone-support depth than the original focused calcium formula.</p>
82 Performance

Ultra BoneUp

Jarrow Formulas
<p>Calcium, vitamin D3, magnesium, MK-7, silicon, boron, and cartilage collagen cover several bone pathways. Broader mineral and vitamin coverage gives it more bone-support depth than the original focused calcium formula. 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 lowers routine cost while maintaining direct calcium support, although carbonate still 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 lowers routine cost while maintaining direct calcium support, although carbonate still 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 lowers routine cost while maintaining direct calcium support, although carbonate still 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. Clearer forms and stronger calcium focus improve practical usefulness compared with the original formula. 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. Clearer forms and stronger calcium focus improve practical usefulness compared with the original formula.</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. Clearer forms and stronger calcium focus improve practical usefulness compared with the original formula. 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
  11. Pregnancy vitamin D supplementation and offspring bone mineral density in childhood follow-up of a randomized controlled trial.
    Moon RJ; D' Angelo S; Curtis EM; Ward KA; Crozier SR; Schoenmakers I; Javaid MK; Bishop NJ; Godfrey KM; Cooper C; Harvey NC; MAVIDOS Trial Group · The American journal of clinical nutrition · 2024
    Randomized trial454 participantsBone Health forVitamin D
  12. Vitamin D analogs and bone: preclinical and clinical studies with eldecalcitol.
    Matsumoto T; Takano T; Saito H; Takahashi F · BoneKEy reports · 2014
    Narrative reviewBone Health forVitamin D
  13. Efficacy of vitamin D fortified foods on bone mineral density and serum bone biomarkers: A systematic review and meta-analysis of interventional studies.
    Tangestani H; Djafarian K; Emamat H; Arabzadegan N; Shab-Bidar S · Critical reviews in food science and nutrition · 2020
    Meta-analysis1,786 participants20 studies pooledBone Health forVitamin D
  14. Cholecalciferol Supplementation Attenuates Bone Loss in Incident Kidney Transplant Recipients: A Prespecified Secondary Endpoint Analysis of a Randomized Controlled Trial.
    Tsujita M; Doi Y; Obi Y; Hamano T; Tomosugi T; Futamura K; Okada M; Hiramitsu T; Goto N; Isaka Y; Takeda A; Narumi S; Watarai Y · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2022
    Randomized trial193 participantsBone Health forVitamin D
  15. Vitamin D supplementation and bone health in post-menopausal women: a 24-month randomized controlled intervention with enhanced bioavailability formulations.
    Rasool N; Munir Y · European journal of clinical nutrition · 2026
    Randomized trial612 participantsBone Health forVitamin D