Calcium 500 + D3

Calcium 500 + D3

21st Century4.8 (8,560 ratings)
Format:Tablet Quantity: 90 Tablet(s) · 90 servings
Goals
$5.49 $0.06 per serving

Product analysis

66 out of 100

Calcium 500 + D3 offers inexpensive support for normal bone mineralization when dietary calcium is low. Its oyster-shell source matters for people avoiding shellfish-derived ingredients.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality18

Oyster shell identifies the calcium source without clarifying its chemical form. That leaves calcium absorption uncertain, despite the named vitamin D3 preparation.

Ingredient Transparency100

Calcium and vitamin D3 amounts and sources are stated. The oyster-shell name still leaves the precise calcium compound unclear.

Value For Money73

An older calcium serving-price comparison suggests an inexpensive option. The separate vitamin D value comparison is unavailable, so that part remains uncertain.

Customer Satisfaction93

Customer feedback is very positive across thousands of ratings. The broad review history shows satisfaction without establishing bone outcomes.

Product Focus78

The combination focuses on filling calcium gaps, with vitamin D helping calcium absorption. These nutritional roles do not establish fewer fractures in adequately nourished adults.

Format
Tablet
Container
90 Tablet(s)
Per serving
$0.06
Customer rating
4.8 · 8,560 ratings
Report analysis

Goals

Bone Health
Impact
High effect
B Ingredient FitD- PathwaysA+ EvidenceA+ Formulation Logic
Calcium · 500 mgVitamin D · 15 mcg
Study evidence
Calcium Supportive 144 studies
Vitamin D Supportive 202 studies

Ingredients

IngredientAmount per servingScore
Vitamin D3 (Cholecalciferol)
15 mcg
Calcium (Oyster Shell)
500 mg 56
Gluten Free Adults 18–50
Report overview
F Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyA+ Value
Report alternatives

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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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