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600+D3

21st Century
4.8
★ ★ ★ ★ ★
(7585 ratings)
Calcium 600 mg
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Score85
Well-sized calcium carbonate and vitamin D3 make a useful basic bone formula. It works best with food and does not provide broader cofactors.
How scoring works
Quantity:400 Tablet(s) • (400 servings)
Goals:
Bone Health

Score 85

Well-sized calcium carbonate and vitamin D3 make a useful basic bone formula. It works best with food and does not provide broader cofactors.
How scoring works
$13.99($0.03 per serving)
Walmart
$ 15.65
iHerb
$ 13.99
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Analysis

Calcium carbonate supplies a useful amount for one serving, while vitamin D3 supports calcium absorption and use. The combination is directly relevant when dietary calcium and vitamin D intake are insufficient.

Carbonate is less flexible than citrate because it depends more on food and stomach acid. The formula also omits vitamin K, magnesium, and bone-matrix nutrients, so its coverage is intentionally narrow.

A straightforward tablet routine may suit people who want core nutrients without a complex blend. Taking it with a meal is the practical way to get the most from the calcium form.

Who is it for
  • Adults needing calcium with vitamin D3
  • Users who prefer a simple tablet routine
  • People who can take calcium with a meal
Best for
  • Basic bone support
  • Moderate calcium supplementation
  • Daily calcium and vitamin D intake

Pros

  • Practical calcium amount for one serving
  • Vitamin D3 supports calcium use
  • Clear and focused active-ingredient list

Cons

  • Carbonate is more dependent on food and stomach acid
  • No vitamin K or magnesium
  • Does not support bone matrix beyond mineral intake

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

85 Highest impact

Vitamin D3 complements a practical calcium amount for bone support. Carbonate is an ordinary form, but the serving is balanced and the formula avoids padding.

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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 an extensive feedback volume. Specific experience details are missing, so recurring problems and purpose fit remain uncertain.

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Value for money

97 Highest impact

The simple formula provides strong quality for the very accessible cost. The large supply delivers exceptional serving value.

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Report analysis

Goals

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

Calcium and vitamin D3 offer a simple, well-aligned bone-support combination. The calcium amount is suitable for one serving and vitamin D3 supports its absorption.

Calcium carbonate works best with food and is less readily absorbed than citrate. The formula remains narrow because it lacks vitamin K, magnesium, and bone-matrix cofactors.

Study evidence
Calcium Supportive 144 studies

Ingredients

IngredientAmount per serving
Vitamin D3 (Cholecalciferol)
20 mcg
Calcium (Calcium Carbonate)
600 mg
Gluten Free Adults 18–50
Report overview
C+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The 600 mg calcium carbonate serving is appropriately sized but generally depends more on food and stomach acid than citrate. Vitamin D3 complements calcium, and no controversial additives appear in the supplied facts. The very low cost per serving makes it an economical basic formula.

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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. Bone turnover and the response to alendronate treatment in postmenopausal osteoporosis.
    Gonnelli S; Cepollaro C; Pondrelli C; Martini S; Montagnani A; Monaco R; Gennari C · Calcified tissue international · 1999
    Randomized trial100 participantsBone Health forCalcium
  4. 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
  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. Calcium and osteoporosis.
    Nordin BE · Nutrition (Burbank, Los Angeles County, Calif.) · 1998
    Meta-analysis20 studies pooledBone Health forCalcium
  7. Dietary calcium intake protects women consuming oral contraceptives from spine and hip bone loss.
    Teegarden D; Legowski P; Gunther CW; McCabe GP; Peacock M; Lyle RM · The Journal of clinical endocrinology and metabolism · 2005
    Randomized trial154 participantsBone Health forCalcium
  8. 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
  9. 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
  10. Effect of milk and calcium supplementation on bone density and bone turnover in pregnant Chinese women: a randomized controlled trail.
    Liu Z; Qiu L; Chen YM; Su YX · Archives of gynecology and obstetrics · 2011
    Randomized trial36 participantsBone Health forCalcium
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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