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Calcium Citrate 1000

4.9
★ ★ ★ ★ ★
(14008 ratings)
Calcium 1000 mg
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Score79

Strong calcium support comes in a tablet, but the large daily amount should be divided and matched to actual dietary need.

How scoring works
Tablet
Quantity:90 Tablet(s) • (30 servings)
Goals:
Bone Health

Score 79

Strong calcium support comes in a tablet, but the large daily amount should be divided and matched to actual dietary need.

How scoring works

Also available as

1 option
180 servings Calcium 1000 mg • 180 Tablet(s) • 60 servings $18.49 ($0.30 per serving)
$11.59($0.38 per serving)
iHerb
$ 11.59
Amazon
$ 11.59
Walmart
$ 11.59
Pure Formulas
$ 11.59
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Analysis

calcium citrate supplies a large elemental calcium amount for people who need a meaningful dietary supplement. The focused single-mineral formula is easy to assess.

Calcium absorption becomes less efficient as the single dose grows, so the daily amount is better divided when the label permits. Citrate can be taken with or without food and is generally more flexible than carbonate.

The tablet is straightforward, and the focused formula is easy to assess. The high daily amount should still be matched to dietary calcium rather than automatically added on top of a calcium-rich diet.

Who is it for
  • Adults with a substantial calcium gap
  • People who prefer calcium citrate
  • Users comfortable with a tablet
Best for
  • Filling a documented calcium shortfall
  • Bone-mineral support
  • Divided calcium supplementation

Pros

  • Substantial elemental calcium
  • calcium citrate is clearly identified
  • Focused single-mineral formula
  • the focused formula is easy to assess

Cons

  • Large amount for one sitting
  • Higher cost than basic carbonate
  • No magnesium or vitamin K
  • Dose should be matched to diet

Warnings

  • Calcium can reduce absorption of levothyroxine, tetracycline antibiotics, and quinolone antibiotics; separate doses according to medication guidance.
  • High supplemental calcium needs medical guidance with kidney stones, high blood calcium, or significant kidney disease.
  • Do not combine with other high-dose calcium products without checking total intake from food and supplements.

Nutrient quality

79 High impact

Calcium citrate is a strong form for focused mineral support. The large serving reduces single-dose efficiency and lacks vitamin D or other bone cofactors.

Ingredient transparency

79 High impact

The calcium form and amount are clearly identified. Intake directions and non-active tablet ingredients are not included in the supplied facts.

Customer satisfaction

74 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

85 Highest impact

A preferred calcium form supports good formula value. Dividing the large serving would improve the practical return from each dose.

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Goals

Bone Health
Bone Health
Impact
Highest effect
A+ Goal FitB Strength of SupportC- CoverageA+ Formula Quality
Calcium · 1000 mg

Calcium citrate supplies the main structural mineral for bone in a well-absorbed form. Human evidence for adequate calcium intake and skeletal maintenance is well established.

The 1,000 mg serving is clearly disclosed but exceeds the amount typically absorbed efficiently at one time. Dividing the three tablets across the day would make the dose more practical, while vitamin D and K would still need to come from other sources.

Study evidence
Calcium Supportive 144 studies

Ingredients

IngredientAmount per serving
Calcium (Calcium Citrate)
 1000 mg
Adults 18–50
Report overview
Calcium (Calcium Citrate) · 1000 mg OverallScore76
A- Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyB+ Value

Calcium citrate offers reliable absorption even when stomach acid is lower. The mineral amount is clearly stated, but the large single serving may not be fully absorbed at once. Cost remains moderate for a citrate product.

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. 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