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600 Calcium Supplement

21st Century
4.7
★ ★ ★ ★ ★
(4793 ratings)
Calcium 600 mg
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Score83
A sensible dose and clear label support straightforward calcium supplementation. Carbonate meal dependence and a calcium-only design are the trade-offs.
How scoring works
Quantity:75 Tablet(s) • (75 servings)
Goals:
Bone Health

Score 83

A sensible dose and clear label support straightforward calcium supplementation. Carbonate meal dependence and a calcium-only design are the trade-offs.
How scoring works

Also available as

1 option
400 servings Calcium 600 mg • 400 Tablet(s) • 400 servings $11.99 ($0.02 per serving)
$4.99($0.06 per serving)
iHerb
$ 4.99
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Analysis

A clearly stated calcium amount can contribute meaningfully when food intake is inadequate. The serving is reasonably sized for a single dose and avoids the inefficiency of very large calcium servings.

Calcium carbonate generally performs best with food and adequate stomach acid. No vitamin D, vitamin K, or magnesium is included, leaving the user to cover those nutrients elsewhere.

The simple tablet format fits people who want only calcium and already have a broader nutrition plan. Anyone using acid-suppressing medicine may find citrate a more dependable choice.

Who is it for
  • Adults wanting a basic calcium-only tablet
  • People whose diet needs a moderate calcium top-up
  • Users who already obtain vitamin D separately
Best for
  • Simple daily calcium intake
  • Use alongside a meal
  • Focused supplementation without extra actives

Pros

  • Efficiently sized single serving
  • Calcium form and amount are disclosed
  • Simple formula is easy to combine with other nutrients

Cons

  • Carbonate is less suitable when stomach acid is low
  • No vitamin D
  • No magnesium, vitamin K, or matrix support

Warnings

  • Calcium can reduce levothyroxine absorption, so follow the medication instructions for spacing the doses.
  • Separate calcium from tetracycline or quinolone antibiotics by the interval stated by the prescriber or pharmacist.
  • Supplemental calcium can cause constipation or bloating; dividing intake may improve tolerance when the label permits it.
  • Calcium carbonate generally works best with food and may be less dependable when stomach acid is low or acid-suppressing medicine is used.

Nutrient quality

81 Highest impact

The calcium amount is near the efficient single-dose range, but carbonate offers only basic form quality. The formula is focused and not excessive, though it provides no supporting cofactors.

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Ingredient transparency

85 Highest impact

Active amounts and serving counts are mostly clear from the supplied label facts. Missing non-active ingredients and complete directions leave practical disclosure gaps.

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Customer satisfaction

73 High impact

The aggregate rating is strong and supported by a very large feedback volume. Specific experience details are missing, so recurring problems and purpose fit remain uncertain.

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Value for money

91 Highest impact

The basic carbonate form is reasonably matched to the accessible cost. Serving value is strong for a simple calcium supplement.

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Report analysis

Goals

Bone Health
Bone Health
Impact
High effect
A- Goal FitB Strength of SupportD+ CoverageB- Formula Quality
Calcium · 600 mg

The efficiently sized calcium serving supplies a core structural mineral for bone. Calcium is well supported when dietary intake falls short.

Calcium carbonate is clearly named but works best with food. The single-ingredient design lacks vitamin D, vitamin K, magnesium, and matrix-support nutrients.

Study evidence
Calcium Supportive 144 studies

Ingredients

IngredientAmount per serving
Calcium (Calcium Carbonate)
 600 mg
Gluten Free Adults 18–50
Report overview
Calcium (Calcium Carbonate) · 600 mg OverallScore86
C+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The 600 mg calcium carbonate dose is efficient for one serving, though it generally absorbs best with food. Its elemental amount and form are clear, and the supplied facts show no concerning additives. The low serving cost supports good value for a straightforward calcium supplement.

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Loading alternative details
88 Performance

Calcium Hydroxyapatite Caps

NOW
<p>Hydroxyapatite supplies a practical calcium amount with naturally paired phosphorus in a simple capsule. Compared with 600 Calcium Supplement, its calcium form and supporting nutrients may be a better fit where carbonate works best with food and the formula omits vitamin D and other bone-supporting cofactors, while clear dosing, strong form quality, and favorable serving value make the formula well suited to routine bone support.</p>
85 Performance

Cal/Mag 500 mg/250 mg

NaturesPlus
<p>Chelated calcium and magnesium provide a focused, balanced mineral formula with strong form quality. Compared with 600 Calcium Supplement, its calcium form and supporting nutrients may be a better fit where carbonate works best with food and the formula omits vitamin D and other bone-supporting cofactors, while a simple one-serving format and economical cost make it one of the better value profiles in this set.</p>
83 Performance

600 + D3 plus Minerals

21st Century
<p>Calcium carbonate and vitamin D3 provide a direct, economical base for bone maintenance. Compared with 600 Calcium Supplement, its calcium form and supporting nutrients may be a better fit where carbonate works best with food and the formula omits vitamin D and other bone-supporting cofactors, while supportive minerals broaden the formula, though oxide forms and small secondary doses keep ingredient quality basic.</p>
85 Budget

600+D3

21st Century
<p>Calcium carbonate and vitamin D3 provide a focused bone-support pairing at exceptionally accessible value. Its lower recurring cost than 600 Calcium Supplement makes it a more economical calcium option, while the calcium amount is reasonably sized, though carbonate works best with food and offers less flexibility than citrate. Calcium should be separated from levothyroxine and tetracycline or quinolone antibiotics because it can reduce their absorption.</p>
85 Budget

Calcium Carbonate

NOW
<p>The pure powder supplies a substantial calcium amount with excellent serving value and no unrelated actives. Its lower recurring cost than 600 Calcium Supplement makes it a more economical calcium option, while calcium carbonate is less flexible than citrate because food and stomach acid aid absorption.</p>
84 Budget

Calcium 600 with Vitamin D3

Nature's Bounty
<p>Calcium and vitamin D3 form a focused, meaningfully dosed bone-support combination with strong serving value. Its lower recurring cost than 600 Calcium Supplement makes it a more economical calcium option, while calcium carbonate is best taken with food, and the formula does not cover magnesium or vitamin K.</p>
85 Value

Cal/Mag Caps

NaturesPlus
<p>Soy amino acid chelates provide a focused calcium-magnesium formula with balanced doses and strong form quality. Compared with 600 Calcium Supplement, its calcium profile offers a practical quality-to-cost trade-off despite not costing less, while good ratings and economical servings support solid value, though the review base is smaller than leading products.</p>
88 Value

Calcium Citrate Pure Powder

NOW
<p>Calcium citrate supplies a substantial, well-absorbed dose in a simple powder with clear active disclosure. Compared with 600 Calcium Supplement, its calcium profile offers a practical quality-to-cost trade-off despite not costing less, while the focused formula offers strong value but does not provide vitamin D, vitamin K, or magnesium.</p>
82 Value

Calcium Citrate

Nature's Way
<p>Citrate and malate improve absorption quality within the mixed calcium formula. Compared with 600 Calcium Supplement, its calcium profile offers a practical quality-to-cost trade-off despite not costing less, while active doses are clear, while missing excipient and full use details limit transparency.</p>
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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Associations of dietary calcium intake with metabolic syndrome and bone mineral density among the Korean population: KNHANES 2008-2011.
    Kim MK; Chon SJ; Noe EB; Roh YH; Yun BH; Cho S; Choi YS; Lee BS; Seo SK · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2018
    Cross-sectional study14,705 participantsBone Health forCalcium
  2. Calcium and osteoporosis.
    Nordin BE · Nutrition (Burbank, Los Angeles County, Calif.) · 1998
    Meta-analysis20 studies pooledBone Health forCalcium
  3. 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
  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