Calcium
Description
Calcium is the most abundant mineral in the human body, primarily stored in bones and teeth, providing structural integrity. It plays a crucial role in maintaining bone density throughout life, preventing conditions like osteoporosis. Beyond structural support, calcium is vital for various physiological processes. It is essential for proper muscle contraction and relaxation, including the heartbeat. Calcium also facilitates nerve signal transmission, enabling communication between the brain and the rest of the body. Furthermore, it is involved in blood clotting mechanisms and hormone secretion, ensuring overall bodily regulation. Maintaining adequate calcium intake is fundamental for overall health. However, its absorption and utilization are complex, often requiring the presence of other nutrients like Vitamin D and Magnesium for optimal efficacy. Dietary sources and supplementation are common ways to ensure sufficient levels.
Sources
Dairy products (milk, yogurt, cheese)Leafy green vegetables (kale, spinach, broccoli)Fortified foods (cereals, orange juice, plant-based milks)TofuSardinesAlmonds
Cheapest Calcium supplements
Best Calcium supplements
Value Calcium supplements
Timing & Intake
AnytimeWith foodTake with Vitamin D, Magnesium
Calcium carbonate is best absorbed with food. Spreading doses throughout the day (e.g., 500mg at a time) can optimize absorption.
Daily Intake
RDA (Men)1000 mg
RDA (Women)1000 mg
RDI1000 mg
Optimal Dosage
Minimum1000 mg
Maximum1500 mg
Safety & Toxicity
Upper Limit (UL)2500 mg
Toxicity Threshold3000 mg
Toxicity EffectKidney stones, impaired absorption of other minerals
Goals
Bone Health
Impact
Highest effect
Typical dose:500–1200 mg
Calcium is the most abundant mineral in the body, with over 99% stored in the skeleton. It serves as the main building block for bone tissue. Adequate intake is crucial to achieve peak bone mass during youth and to minimize bone loss with age.
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Nail Health
Impact
Limited evidence
Typical dose:500–1200 mg
While nails are composed of keratin protein, not primarily calcium, severe calcium deficiency can affect overall health, which may be reflected in nail quality. It plays a supportive role in cellular processes and maintaining the hardness of surrounding bone and tissues.
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Interactions
Positive Interactions
Vitamin D
Vitamin D is crucial for the absorption of calcium in the intestines.
Magnesium
Magnesium works synergistically with calcium in bone formation, muscle contraction, and nerve function, and helps regulate calcium levels.
Vitamin K
Vitamin K directs calcium to the bones and helps prevent its deposition in soft tissues like arteries.
Phosphorus
Calcium and Phosphorus are the primary minerals for forming and maintaining strong bones and teeth.
Recommended products
Calcium 500 mg with Vitamin D3
Nature's Bounty
Calcium: 500 mg
A bulk-sized, natural oyster shell calcium and D3 supplement for simple and affordable bone care.
Calcium Citrate Caps
NOW
Calcium: 450 mg
A highly bioavailable calcium supplement that includes trace minerals for comprehensive skeletal support.
Cal-Mag Asportates
Solaray
Calcium: 500 mg
A chelated calcium and magnesium supplement with a herbal base to support bone integrity and mineral balance.
Calcium Bone Maker Complex with MCH-Cal and VitaMK7
Doctor's Best
Calcium: 300 mg
A premium bone health complex using bone-derived minerals and K2 for optimal density and structure.
Calcium Citrate +D3 Maximum
21st Century
Calcium: 630 mg
A reliable 60-day supply of well-absorbed calcium citrate and vitamin D3 for skeletal maintenance.
Calcium Citrate Pure Powder
NOW
Calcium: 600 mg
A pure and highly absorbable calcium powder that is easy to customize and gentle on the stomach.
600 Calcium Supplement
21st Century
Calcium: 600 mg
An ultra-affordable, large-count bottle of calcium carbonate for long-term daily bone support.
Calcium 500 + D3
21st Century
Calcium: 500 mg
An incredible value, 400-count supply of natural oyster shell calcium and vitamin D3.
Calcium Mag & Zinc Mineral Complex
Nature's Way
Calcium: 500 mg
An economical large-count mineral complex for long-term structural and bone support.
Cal/Mag Caps
NaturesPlus
Calcium: 500 mg
Well-absorbed chelated calcium and magnesium capsules for effective bone support.
Cal/Mag with Whole Foods
NaturesPlus
Calcium: 500 mg
A high-quality plant-based mineral complex with whole-food cofactors for bone health.
Cal/Mag 500 mg/250 mg
NaturesPlus
Calcium: 500 mg
A premium chelated calcium and magnesium tablet for superior absorption and digestive comfort.
Albion Chelated Calcium 180 mg
Swanson Ultra
Calcium: 360 mg
A premium, easy-to-digest chelated calcium that is gentle on the stomach and highly absorbable.
Ultra BoneUp
Jarrow Formulas
Calcium: 400 mg
A high-quality MCHA calcium and collagen blend for comprehensive bone and connective tissue support.
Calcium (Carbonate Aspartate & Citrate) 500 mg
Swanson Premium Brand
Calcium: 500 mg
A diverse triple-form calcium blend designed to support absorption under various digestive conditions.
Chewable Calcium
Swanson Premium Brand
Calcium: 500 mg
An easy-to-take chewable calcium tablet with a touch of Vitamin D3 for basic bone support.
600+D3
21st Century
Calcium: 600 mg
A high-value, 400-count bottle of calcium and Vitamin D3 for consistent, everyday bone support.
Bone Restore with Vitamin K2
Life Extension
Calcium: 700 mg
A premium bone health complex featuring MK-7 and chelated calcium for optimized mineral management.
Calcium Carbonate
NOW
Calcium: 600 mg
An ultra-affordable and pure calcium powder that offers high mineral yield and no extra additives.
Calcium Citrate Magnesium and Zinc
Kirkland Signature
Calcium: 500 mg
A bulk-sized, comprehensive mineral supplement focused on bone health with a balanced 1 mg dose of copper.
Calcium Hydroxyapatite Caps
NOW
Calcium: 500 mg
A high-quality, bioavailable calcium and phosphorus supplement that matches natural bone structure.
Calcium 500+D3
21st Century
Calcium: 500 mg
A high-count, natural oyster shell calcium supplement that provides long-lasting value and skeletal support.
100% Pure & Dairy-Free Calcium Citrate
Swanson Premium Brand
Calcium: 350 mg
A pure, additive-free calcium citrate powder that offers superior absorption and excellent value.
Calcium Carbonate 650 mg Unflavored
Nutricost
Calcium: 650 mg
A pure, high-concentration calcium carbonate powder for customizable and affordable mineral support.
TriCalcium Complex with D & K
Swanson Premium Brand
Calcium: 350 mg
A comprehensive calcium complex with vitamins D and K for advanced skeletal support at a great value.
Calcium Citrate
NOW
Calcium: 600 mg
A comprehensive multi-mineral tablet that supports joints, bones, and metabolic health.
Calcium Magnesium Zinc + Vitamin D3
AN Amazing Nutrition Amazing Formulas
Calcium: 1000 mg
This all-in-one tablet combines essential Calcium, Magnesium, Zinc, and Vitamin D3 to support bone health, immune function, and overall well-being, though some forms might not be optimally absorbed.
Product stats
Price per product
Average$22.43
Median$18.71
Price per serving
Average$0.64
Median$0.38
Price per 1000 mg
Average$0.75
Median$0.37
Price distribution
Price per serving distribution
Price per 1000 mg
Reference amount: 1000 mg
Forms
Paired ingredients
Ingredient forms
Calcium Carbonate (296)75
Calcium carbonate is a widely available and cost-effective form of calcium, containing approximately 40% elemental calcium by weight. Its absorption is acid-dependent, meaning it requires stomach acid for optimal dissolution and uptake, making it most effective when taken with meals.
Pros
- High elemental calcium content per pill
- Inexpensive
- Widely available
Cons
- Requires stomach acid for absorption (best taken with food)
- Can cause gas, bloating, and constipation in some individuals
Per product
Avg$19.92
Med$17.86
Per serving
Avg$0.40
Med$0.28
Per 100 mg
Avg$0.11
Med$0.06
Price distribution
Calcium Citrate (239)85
Calcium citrate is a highly bioavailable form of calcium, containing about 21% elemental calcium by weight. Unlike calcium carbonate, its absorption is not dependent on stomach acid, allowing it to be taken with or without food. It is generally better tolerated and less likely to cause gastrointestinal side effects.
Pros
- Excellent bioavailability
- Can be taken with or without food
- Less likely to cause constipation or gas
Cons
- Lower elemental calcium per tablet requires more pills for the same dose
- Generally more expensive than calcium carbonate
Per product
Avg$30.91
Med$23.09
Per serving
Avg$0.89
Med$0.55
Per 100 mg
Avg$0.16
Med$0.06
Price distribution
Dicalcium Phosphate (84)70
Dicalcium phosphate is a dietary supplement ingredient that provides both calcium and phosphorus, two essential minerals crucial for bone health and other physiological processes. While it provides elemental calcium, its bioavailability can vary and may be lower than more soluble forms like calcium citrate. It is commonly found in multi-mineral supplements.
Pros
- Provides both calcium and phosphorus
- Supports bone and teeth structure
Cons
- Bioavailability may be less optimal than other forms
- Lower elemental calcium contribution compared to carbonate
Per product
Avg$29.15
Med$18.51
Per serving
Avg$1.10
Med$0.34
Per 100 mg
Avg$0.18
Med$0.09
Price distribution
Calcium Ascorbate (44)65
Calcium ascorbate is a mineral salt of ascorbic acid (Vitamin C). It provides a non-acidic form of Vitamin C, which is often preferred by individuals sensitive to the acidity of pure ascorbic acid. While it contains some elemental calcium, its primary purpose is as a Vitamin C source for immune support, antioxidant activity, and collagen formation, not as a major calcium supplement for bone health.
Pros
- Non-acidic Vitamin C
- Provides antioxidant benefits
- Supports collagen synthesis
Cons
- Provides a relatively small amount of elemental calcium
- Not a primary calcium source
Per product
Avg$33.72
Med$29.49
Per serving
Avg$0.86
Med$0.71
Per 100 mg
Avg$0.17
Med$0.11
Price distribution
Calcium Malate (35)80
Calcium malate is a calcium salt of malic acid, an organic acid found in many fruits. This form is considered to have good bioavailability and absorption, similar to calcium citrate, and is generally well-tolerated without significant gastrointestinal side effects. It provides a reliable source of elemental calcium for various bodily functions.
Pros
- Good bioavailability and absorption
- Generally well-tolerated
Cons
- Less common and potentially more expensive than calcium carbonate
- Lower elemental calcium per dose compared to carbonate
Per product
Avg$29.31
Med$23.67
Per serving
Avg$0.60
Med$0.37
Per 1000 mg
Avg$1.28
Med$0.46
Price distribution
Calcium D-Pantothenate (29)60
Calcium D-pantothenate is the calcium salt of D-pantothenic acid, also known as Vitamin B5. While it contains calcium, its primary role in supplements is to deliver pantothenic acid, which is vital for energy metabolism and hormone synthesis. The elemental calcium contribution is relatively small and it is not typically used as a primary calcium supplement for bone health.
Pros
- Excellent source of Vitamin B5
Cons
- Provides minimal elemental calcium compared to dedicated calcium supplements
- Not intended as a primary calcium source
Per product
Avg$35.16
Med$31.99
Per serving
Avg$1.11
Med$0.79
Per 100 mg
Avg$0.19
Med$0.12
Price distribution
Calcium Amino Acid Chelate (17)90
Calcium amino acid chelates (e.g., calcium bisglycinate, calcium glycinate) are forms where calcium ions are bonded to amino acids. This chelation process protects the mineral from interference in the gut, leading to superior absorption and bioavailability compared to inorganic forms. They are often well-tolerated and less likely to cause gastrointestinal discomfort.
Pros
- Superior absorption and bioavailability
- Generally gentle on the stomach
- Well-tolerated
Cons
- Can be significantly more expensive than other forms
- Elemental calcium content can vary depending on the specific chelate
Per product
Avg$28.24
Med$26.08
Per serving
Avg$0.57
Med$0.52
Per 1000 mg
Avg$0.82
Med$0.62
Price distribution
Calcium Hydroxyapatite (15)88
Calcium hydroxyapatite is a microcrystalline hydroxyapatite (MCHA) complex derived from bovine bone. It provides calcium, phosphorus, and other naturally occurring trace minerals in a highly bioavailable form, mirroring the mineral matrix of human bone. This form is believed to offer benefits beyond elemental calcium due to its complex natural composition.
Pros
- Natural, bone-derived source
- Contains phosphorus and trace minerals in physiological ratios
- May offer holistic bone support
Cons
- Higher cost
- Potential concerns for those avoiding animal products
- Elemental calcium content can be lower per dose than carbonate
Per product
Avg$26.30
Med$25.99
Per serving
Avg$0.48
Med$0.43
Per 1000 mg
Avg$0.20
Med$0.14
Price distribution