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600+D3

21st Century
4.8
★ ★ ★ ★ ★
(7559 ratings)
Calcium 600 mg
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Score84

A practical carbonate dose with vitamin D3 offers good value, though meal timing and missing label details deserve attention.

How scoring works
Quantity:75 Tablet(s) • (75 servings)
Goals:
Bone Health

Score 84

A practical carbonate dose with vitamin D3 offers good value, though meal timing and missing label details deserve attention.

How scoring works

Also available as

3 options
400 servings Calcium 600 mg • 400 Tablet(s) • 400 servings $11.99 ($0.02 per serving) 400 servings Calcium 600 mg • 400 Tablet(s) • 400 servings $13.99 ($0.03 per serving) 75 servings Calcium 600 mg • 75 Tablet(s) • 75 servings $4.99 ($0.06 per serving)
$4.99($0.06 per serving)
iHerb
$ 4.99
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Analysis

The calcium amount is near the upper end of what fits comfortably in one sitting. Vitamin D3 adds useful support for calcium absorption and bone-mineral maintenance.

Carbonate is economical and compact but works best with food and sufficient stomach acid. People using acid-suppressing medicines may find citrate a more predictable choice.

The long supply supports routine value, yet the supplied record lacks directions and inactive ingredients. The package should be checked for tablet count per serving, allergen details, and meal timing.

Who is it for
  • Adults seeking low-cost calcium plus D3
  • People who can take calcium with meals
  • Users with a moderate dietary calcium gap
Best for
  • One-dose calcium support
  • Calcium plus vitamin D3
  • Economical long-term use

Pros

  • Well-sized calcium amount
  • Vitamin D3 included
  • Strong serving value
  • Long package supply

Cons

  • Works best with food
  • Inactive ingredients are not supplied
  • No magnesium or vitamin K
  • Less suitable with low stomach acid

Warnings

  • Separate calcium from levothyroxine and certain antibiotics according to medication guidance.
  • Kidney stones, high blood calcium, or significant kidney disease require medical guidance.
  • Check the package directions and inactive ingredients because they are missing from the supplied record.

Nutrient quality

86 Highest impact

Calcium and vitamin D are sensibly paired in useful amounts. Carbonate is less flexible than citrate and may cause digestive discomfort in sensitive users.

Ingredient transparency

79 High impact

The active forms and amounts are clearly identified. Intake directions and non-active tablet ingredients are not included in the supplied facts.

Customer satisfaction

73 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

97 Highest impact

Useful calcium and vitamin D are delivered at a very low ongoing cost. The focused formula compares favorably with similar basic supplements.

Report analysis

Goals

Bone Health
Bone Health
Impact
Highest effect
A+ Goal FitA- Strength of SupportB CoverageA+ Formula Quality
Calcium · 600 mgVitamin D · 20 mcg

Calcium at 600 mg provides structural material, while vitamin D3 supports its absorption. The pairing is strongly supported for bone maintenance when dietary intake or vitamin D status is inadequate.

calcium carbonate is clearly disclosed, and the 20 mcg vitamin D3 amount provides useful cofactor support. Vitamin K and protein-matrix support are not included, so pathway coverage remains limited.

Study evidence
Calcium Supportive 144 studies
Vitamin D Supportive 202 studies

Ingredients

IngredientAmount per serving
Vitamin D3 (Cholecalciferol)
 20 mcg
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

Calcium carbonate is a basic source that generally absorbs better with food. The serving amount reaches the upper edge of the efficient uptake range, and the mineral quantity is clear. Very low cost and a simple ingredient profile support strong value.

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. Citrate or chelated forms offer more absorption flexibility than the original carbonate or oyster-derived source.</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 calcium-and-vitamin-D pairing.</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 calcium-and-vitamin-D pairing. 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 lowers routine cost while maintaining direct calcium support, although carbonate still 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 lowers routine cost while maintaining direct calcium support, although carbonate still 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 lowers routine cost while maintaining direct calcium support, although carbonate still 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. Citrate or chelated forms offer more absorption flexibility than the original carbonate or oyster-derived source. 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. Citrate or chelated forms offer more absorption flexibility than the original carbonate or oyster-derived source.</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 keeps calcium support economical, although the same food-dependent carbonate limitation remains. 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
  11. Pregnancy vitamin D supplementation and offspring bone mineral density in childhood follow-up of a randomized controlled trial.
    Moon RJ; D' Angelo S; Curtis EM; Ward KA; Crozier SR; Schoenmakers I; Javaid MK; Bishop NJ; Godfrey KM; Cooper C; Harvey NC; MAVIDOS Trial Group · The American journal of clinical nutrition · 2024
    Randomized trial454 participantsBone Health forVitamin D
  12. Vitamin D analogs and bone: preclinical and clinical studies with eldecalcitol.
    Matsumoto T; Takano T; Saito H; Takahashi F · BoneKEy reports · 2014
    Narrative reviewBone Health forVitamin D
  13. Efficacy of vitamin D fortified foods on bone mineral density and serum bone biomarkers: A systematic review and meta-analysis of interventional studies.
    Tangestani H; Djafarian K; Emamat H; Arabzadegan N; Shab-Bidar S · Critical reviews in food science and nutrition · 2020
    Meta-analysis1,786 participants20 studies pooledBone Health forVitamin D
  14. Cholecalciferol Supplementation Attenuates Bone Loss in Incident Kidney Transplant Recipients: A Prespecified Secondary Endpoint Analysis of a Randomized Controlled Trial.
    Tsujita M; Doi Y; Obi Y; Hamano T; Tomosugi T; Futamura K; Okada M; Hiramitsu T; Goto N; Isaka Y; Takeda A; Narumi S; Watarai Y · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2022
    Randomized trial193 participantsBone Health forVitamin D
  15. Vitamin D supplementation and bone health in post-menopausal women: a 24-month randomized controlled intervention with enhanced bioavailability formulations.
    Rasool N; Munir Y · European journal of clinical nutrition · 2026
    Randomized trial612 participantsBone Health forVitamin D