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Calcium Citrate 1000 mg

4.8
★ ★ ★ ★ ★
(18510 ratings)
Calcium 1000 mg
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Score80
A good-value calcium blend whose four-capsule serving is well suited to divided use. Mixed forms and missing bone-support cofactors keep it below the strongest citrate-based combinations.
How scoring works
Capsule
Quantity:120 VegCap(s) • (30 servings)
Goals:
Bone Health

Score 80

A good-value calcium blend whose four-capsule serving is well suited to divided use. Mixed forms and missing bone-support cofactors keep it below the strongest citrate-based combinations.
How scoring works
$14.79($0.49 per serving)
iHerb
$ 14.79
Vitacost
$ 14.79
Pure Formulas
$ 14.79
Amazon
$ 14.79
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Analysis

The serving provides 1,000 mg of calcium from citrate and carbonate sources. Citrate improves the blend, while carbonate is more dependent on food and stomach acid.

Four capsules make it practical to split the serving across the day. Taking the full amount at once would be less efficient because calcium absorption declines as a single dose becomes larger.

The formula offers useful mineral value for people who need significant calcium. It remains a calcium-only approach without vitamin D, vitamin K, or magnesium to broaden bone support.

Who is it for
  • Adults needing substantial supplemental calcium
  • People comfortable taking several capsules
  • Users willing to divide calcium across the day
Best for
  • Divided calcium dosing
  • A mix of citrate and carbonate forms
  • Calcium-focused supplementation

Pros

  • Includes calcium citrate alongside carbonate
  • Four-capsule serving supports flexible dosing
  • Provides strong mineral value

Cons

  • Full 1,000 mg serving is too large for efficient use at once
  • Carbonate is more dependent on food and stomach acid
  • Lacks vitamin D, vitamin K, and magnesium

Warnings

  • Split the 1,000 mg calcium serving when the directions allow; a large single dose may absorb less efficiently and cause digestive discomfort.

Nutrient quality

81 Highest impact

The substantial calcium amount and citrate component provide useful nutrient support. Carbonate and an oversized single serving reduce absorption quality.

Ingredient transparency

74 High impact

The total calcium dose and both source names are disclosed. Form allocation, timing directions, and inactive ingredients remain incomplete.

Customer satisfaction

73 High impact

The aggregate rating is strong and supported by an exceptionally large evidence base. Specific experience evidence is missing, so repeated problems and purpose alignment remain unknown.

Value for money

92 Highest impact

A substantial calcium supply and low recurring cost create strong value. The mixed forms keep quality below a citrate-only option.

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Goals

Bone Health
Impact
High effect
A+ Goal FitC+ Strength of SupportC- CoverageB Formula Quality
Calcium · 1000 mg

Calcium directly supports bone mineralization, and the blend includes citrate alongside carbonate. The mixed forms provide useful calcium but are less consistently absorbed than a citrate-only formula.

The full 1000 mg serving is larger than the amount usually absorbed efficiently at one time. Dividing the serving across the day would better match calcium absorption, while the lack of vitamin D or vitamin K limits pathway coverage.

Study evidence
Calcium Supportive 144 studies

Ingredients

IngredientAmount per serving
Calcium (Calcium Carbonate, Calcium Citrate)
1000 mg
Adults 18–50 Vegan Dairy Free Vegetarian
Report overview
B Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyB+ Value

Calcium citrate improves the blend, but calcium carbonate makes absorption quality mixed. The 1000 mg serving is larger than the amount usually absorbed most efficiently at once, so dividing it may improve use. The cost is favorable, and no flagged additives appear in the supplied ingredient data.

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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