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Calcium Citrate 1000 mg

4.8
★ ★ ★ ★ ★
(18522 ratings)
Calcium 1000 mg
Product Image
Score77
A mixed citrate-carbonate calcium product with competitive value but an oversized full serving. Divide the dose and recognize that the source proportions are unclear.
How scoring works
Capsule
Quantity:240 VegCap(s) • (60 servings)
Goals:
Bone Health

Score 77

A mixed citrate-carbonate calcium product with competitive value but an oversized full serving. Divide the dose and recognize that the source proportions are unclear.
How scoring works

Also available as

1 option
30 servings Calcium 1000 mg • 120 VegCap(s) • 30 servings $14.79 ($0.49 per serving)
$19.07($0.31 per serving)
iHerb
$ 21.59
Vitacost
$ 21.59
Pure Formulas
$ 21.59
Amazon
$ 19.07
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Analysis

Calcium citrate gives the blend a better absorption profile than carbonate alone. The vegetable-capsule format may suit users avoiding gelatin.

The full amount should generally be divided if the label directions permit because calcium absorption becomes less efficient in very large single doses. Missing source proportions prevent judging how much of the serving comes from the better citrate form.

No vitamin D, magnesium, vitamin K, or collagen pathway is addressed. The formula works as focused calcium but requires dietary cofactor support.

Who is it for
  • Adults seeking a vegetable-capsule calcium
  • Users able to split a large serving
  • People whose diet covers bone cofactors
Best for
  • Focused calcium supplementation
  • Divided calcium dosing
  • Citrate-carbonate routines

Pros

  • Includes calcium citrate
  • Vegetable-capsule format
  • Competitive value

Cons

  • Full serving is too large for one dose
  • Citrate-to-carbonate ratio is undisclosed
  • No vitamin D or magnesium

Warnings

  • Divide the large calcium serving if permitted by the product directions.
  • Carbonate-containing calcium is best taken with food.
  • Keep calcium separate from levothyroxine and certain antibiotics.

Nutrient quality

82 Highest impact

A substantial amount and inclusion of citrate support the formula. The aggressive dose and mixed form make it less flexible.

Ingredient transparency

75 High impact

The calcium forms are specific and no proprietary blend is present. Duplicate dose entries, incomplete directions, and missing non-active ingredients reduce clarity.

Customer satisfaction

74 High impact

The aggregate rating is favorable and backed by a very large review volume. No specific comments are available to assess recurring problems or real-world fit.

Value for money

78 High impact

A quality citrate component supports fair value. The four-capsule burden and aggressive dose reduce efficiency.

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Goals

Bone Health
Bone Health
Impact
High effect
A- Goal FitB- Strength of SupportD CoverageB Formula Quality
Calcium · 1000 mg

A citrate and carbonate blend provides direct structural calcium, with citrate supplying the better-absorbed component. The formula lacks vitamin D, vitamin K, magnesium, and collagen support.

The full amount is too large for efficient absorption in one sitting, so divided use may be more practical. The undisclosed share from each calcium form also limits quality assessment.

Study evidence
Calcium Supportive 144 studies

Ingredients

IngredientAmount per serving
Calcium (Calcium Carbonate, Calcium Citrate)
 1000 mg
Adults 18–50
Report overview
Calcium (Calcium Carbonate, Calcium Citrate) · 1000 mg OverallScore72
B Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyB+ Value

The citrate and carbonate blend offers mixed absorption quality, with citrate providing the more dependable component. The full serving exceeds the range that is usually absorbed most efficiently at one time, so divided intake may be more practical. Serving cost remains competitive, and no concerning additives are disclosed.

View ingredientView products
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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