Stackexpand_less
Analysisexpand_less
Please sign in to access analysis.
Profileexpand_less
Supplementsexpand_more
Calcium 500 + D3
21st Century
4.8
★ ★ ★ ★ ★
(4031 ratings)
Calcium 500 mg
Score 75.0
An exceptionally affordable calcium carbonate supplement from oyster shell, combined with Vitamin D3 for enhanced absorption and effective bone support.
Quantity: 400 Tablet(s)Servings size: 1 Tablet(s) (400 servings)
Selected goals:
Other goals:
Bone Health
Heart Health
Joint Health
Muscle Gain
Fitness
leaderboard Score 75.0
An exceptionally affordable calcium carbonate supplement from oyster shell, combined with Vitamin D3 for enhanced absorption and effective bone support.
Quantity: 90Quantity: 400Quantity: 90
21st Century's Calcium 500 + D3, sourced from Oyster Shell, presents a highly economical solution for calcium supplementation. It delivers 500mg of elemental calcium per serving, paired with 15mcg (600 IU) of Vitamin D3. The inclusion of Vitamin D3 is a significant advantage, as it plays a pivotal role in optimizing the body's absorption of calcium and its proper integration into bone tissue, enhancing the overall efficacy for bone health. While oyster shell calcium is essentially calcium carbonate and therefore best absorbed when taken with food, its outstanding affordability makes it an accessible and effective option for individuals looking to maintain adequate calcium and D3 levels.
- Extremely affordable price per serving.
- Contains both calcium and essential Vitamin D3.
- Good elemental calcium dose.
- Calcium carbonate (oyster shell) is best taken with food for optimal absorption.
$10.00($0.02 per serving)
 iHerb | $ 10.00 |
| Ingredient | Amount per serving |
|---|---|
| Vitamin D3 (Cholecalciferol) | 15 mcg |
| Calcium (Oyster) | 500 mg |
Categories
Calcium 75.0
Delivers a good dose of elemental calcium with Vitamin D3, providing effective and affordable calcium supplementation.
Goals
Bone Health 75.0
Delivers a good dose of elemental calcium and includes essential Vitamin D3 for improved absorption and bone mineralization, providing solid foundational support for bone health at a very low cost.
Fitness 70.0
Offers calcium for muscle contraction and bone strength, crucial for physical performance and mitigating skeletal stress during activity. The D3 inclusion enhances this benefit.
Joint Health 65.0
Supports joint integrity indirectly through strengthening bones, with D3 further enhancing the calcium benefits for overall skeletal system support.
Recommended Alternatives
85 Value 
Calcium Magnesium Zinc + D3
21st Century
4.7
★★★★★
(97627 ratings)
Offers a comprehensive combination of calcium, magnesium, zinc, and D3 at an exceptionally low price, providing significantly more synergistic nutrients for better overall bone health value.
90 Value 
600 + D3 plus Minerals
21st Century
4.8
★★★★★
(1551 ratings)
A 21st Century product that includes calcium, D3, and a range of essential trace minerals, offering a more complete bone support formula at a superior value compared to the original.
88 Value 
Calcium + Vitamin D
Swisse Ultiboost
4.6
★★★★★
(1270 ratings)
Combines calcium citrate (better absorption) and carbonate with D3, offering a balanced and effective formula at a competitive price, delivering excellent value.
96 Performance 
Calcium Bone Maker Complex with MCH-Cal and VitaMK7
Doctor's Best
4.7
★★★★★
(6735 ratings)
A superior alternative featuring MCH-Cal and synergistic nutrients like K2 and additional minerals, offering enhanced bone density support far beyond simple oyster calcium.
98 Performance 
Raw Calcium
Garden of Life Vitamin Code
4.6
★★★★★
(4135 ratings)
A premium plant-based calcium source with a full spectrum of bone-supporting nutrients like D3, K2, and magnesium, delivering a more holistic and bioavailable approach to bone health.
93 Performance 
Liquid Cal/Mag/Zinc Natural Strawberry Flavor
Trace Minerals
4.4
★★★★★
(1954 ratings)
A liquid formula with highly absorbable calcium, magnesium, zinc, and D3, providing a more complete and bioavailable mineral profile for comprehensive bone support.
50 Budget 
600 Calcium Supplement
21st Century
4.7
★★★★★
(4047 ratings)
A basic calcium carbonate option at a similar, slightly lower price per serving, offering a highly economical choice for fundamental calcium intake.
80 Budget 
600+D3
21st Century
4.8
★★★★★
(6905 ratings)
Offers calcium carbonate with Vitamin D3 at a comparable or slightly lower price per serving, providing a good blend for bone health.
70 Budget 
Calcium 500+D3
21st Century
4.8
★★★★★
(5027 ratings)
An almost identical product from the same brand with similar ingredients (Oyster Calcium + D3), offering a cost-effective alternative.
85 Value
Calcium Magnesium Zinc + D3
21st Century
4.7
★★★★★
(97627 ratings)
Offers a comprehensive combination of calcium, magnesium, zinc, and D3 at an exceptionally low price, providing significantly more synergistic nutrients for better overall bone health value.
90 Value
600 + D3 plus Minerals
21st Century
4.8
★★★★★
(1551 ratings)
A 21st Century product that includes calcium, D3, and a range of essential trace minerals, offering a more complete bone support formula at a superior value compared to the original.
88 Value
Calcium + Vitamin D
Swisse Ultiboost
4.6
★★★★★
(1270 ratings)
Combines calcium citrate (better absorption) and carbonate with D3, offering a balanced and effective formula at a competitive price, delivering excellent value.
96 Performance
Calcium Bone Maker Complex with MCH-Cal and VitaMK7
Doctor's Best
4.7
★★★★★
(6735 ratings)
A superior alternative featuring MCH-Cal and synergistic nutrients like K2 and additional minerals, offering enhanced bone density support far beyond simple oyster calcium.
98 Performance
Raw Calcium
Garden of Life Vitamin Code
4.6
★★★★★
(4135 ratings)
A premium plant-based calcium source with a full spectrum of bone-supporting nutrients like D3, K2, and magnesium, delivering a more holistic and bioavailable approach to bone health.
93 Performance
Liquid Cal/Mag/Zinc Natural Strawberry Flavor
Trace Minerals
4.4
★★★★★
(1954 ratings)
A liquid formula with highly absorbable calcium, magnesium, zinc, and D3, providing a more complete and bioavailable mineral profile for comprehensive bone support.