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Calcium Citrate

Nature's Way
4.8
★ ★ ★ ★ ★
(2267 ratings)
Calcium 500 mg
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Score82
A useful 500 mg multi-form calcium capsule, with good citrate and malate inclusion but unclear form proportions.
How scoring works
Quantity:250 Capsule(s) • (125 servings)
Goals:
Bone Health

Score 82

A useful 500 mg multi-form calcium capsule, with good citrate and malate inclusion but unclear form proportions.
How scoring works

Also available as

1 option
50 servings Calcium 500 mg • 100 Capsule(s) • 50 servings $12.49 ($0.24 per serving)
$23.13($0.18 per serving)
iHerb
$ 24.49
Vitacost
$ 24.49
Vitacost
$ 24.49
Pure Formulas
$ 23.13
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Analysis

The 500 mg elemental amount fits efficient single-dose supplementation and directly supports bone mineral intake. Citrate and malate improve the form mix, especially for users concerned about stomach-acid dependence.

Carbonate is also listed, but the amount from each calcium source is not disclosed. That prevents a precise judgment of how much of the serving comes from the more favorable citrate and malate forms.

The focused capsule provides calcium without a crowded active list. Vitamin D, magnesium, vitamin K2, and collagen-related nutrients need to come from diet or separate supplementation.

Who is it for
  • Adults seeking a multi-form calcium product
  • Users filling a moderate calcium gap
  • People who prefer capsules
Best for
  • Bone mineral intake
  • Calcium supplementation
  • Mixed-form calcium use

Pros

  • Practical 500 mg amount
  • Includes citrate and malate
  • Clear total elemental calcium
  • Focused formula

Cons

  • Amount from each form is unclear
  • Contains some carbonate
  • No vitamin D
  • No magnesium or vitamin K

Warnings

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

Nutrient quality

95 Highest impact

Citrate and malate improve absorption quality within the mixed calcium formula. The 500 mg elemental calcium amount is meaningful for supplementation.

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Ingredient transparency

72 High 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

66 High 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

98 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 SupportD+ CoverageA- Formula Quality
Calcium · 500 mg

A 500 mg calcium amount directly supplies a major structural mineral for bone. Citrate and malate improve the form mix, though carbonate is also present and the share from each form is unclear.

The focused formula gives useful calcium depth but does not include vitamin D, magnesium, vitamin K2, or collagen. Calcium can interfere with absorption of levothyroxine and certain antibiotics when taken together, so doses should be separated.

Study evidence
Calcium Supportive 144 studies

Ingredients

IngredientAmount per serving
Calcium (Calcium Carbonate, Calcium Citrate, Calcium Malate)
 500 mg
Gluten Free Adults 18–50 Dairy Free
Report overview
Calcium (Calcium Carbonate, Calcium Citrate, Calcium Malate) · 500 mg OverallScore100
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The formula combines citrate and malate with carbonate, giving broader absorption support than carbonate alone. Its moderate serving amount fits the body's per-dose absorption range. A very low serving cost makes it efficient for regular supplementation.

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>
83 Value

Albion Chelated Calcium 180 mg

Swanson Ultra
<p>A calcium glycinate chelate and a small vitamin D3 addition provide useful form quality at favorable value. It preserves a well-absorbed calcium approach while improving either serving flexibility or practical value over the original. The product name and supplied serving amount conflict, so the current label should be checked.</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. 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
  2. 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
  3. 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
  4. 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
  5. 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