NEW
🦴 Calcium
Cost per serving
$0.45
Pricey
mineral · 64 active deals
The best-value Calcium right now is about $0.04 per dose — across 64 tracked products the median is $0.158/dose, so shopping on cost-per-dose can cut your cost several-fold. Every Calcium deal here is ranked by cost per dose— what you actually pay per serving, not the sticker price — because forms and absorption differ, so the cheapest bottle isn’t always the cheapest dose.
Right now the best value across our full Calcium catalog is at $0.04 per serving.
Recommended daily intake
Best absorbed in doses ≤500 mg at a time; pair with vitamin D/K2. General FDA/NIH adult guidance — not medical advice.
Calcium is the most abundant mineral in the body and makes up much of the structure of bones and teeth, keeping tissue rigid, strong, and flexible. According to the NIH, the small ionized pool of calcium also mediates blood vessel contraction and dilation, muscle function, blood clotting, nerve transmission, and hormonal secretion. About 98% of the body's calcium is stored in the bones, which the body uses as a reservoir to maintain calcium homeostasis; the NIH notes that for adults the intake recommendations are based on the amount needed to promote bone maintenance and neutral calcium balance, and that vitamin D is required for calcium to be absorbed in the gut by active transport. — per the NIH Office of Dietary Supplements; not medical advice.
The NIH states the two most common forms of calcium in supplements are calcium carbonate and calcium citrate, with other forms including calcium sulfate, ascorbate, microcrystalline hydroxyapatite, gluconate, lactate, and phosphate. These forms contain varying amounts of elemental calcium (for example, calcium carbonate is 40% calcium by weight while calcium citrate is 21%). The NIH notes that in people with low stomach acid, calcium carbonate's solubility is lower, which could reduce absorption unless it is taken with a meal, whereas calcium citrate is less dependent on stomach acid and can be taken without food; in general, absorption of calcium supplements is greater when they are taken with food and is highest at doses of 500 mg or less.
A supplement's front-label figure is usually the compound weight, not elemental calcium. By weight, calcium carbonate is about 40% elemental while gluconate is only about 9% — so a “1,000 mg gluconate” capsule delivers roughly 90 mg of elemental calcium. Always compare the “Calcium” line in the Supplement Facts panel, not the number on the front of the bottle.
| calcium form | ~% elemental | elemental mg per 1,000 mg |
|---|---|---|
| calcium carbonate |
Every Calcium deal above is ranked by real cost per dose with no paid placement — see our and .
Independent third-party testing is a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
Recommended Dietary Allowances are 1,000 mg/day for adults age 19 to 50, and for men age 51 to 70. Women over 50 and everyone over 70 need 1,200 mg. Teens age 14 to 18 (including pregnant and lactating) need 1,300 mg. Younger children range from 700 to 1,300 mg by age. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Yes. The is 2,500 mg/day for adults age 19 to 50 and 2,000 mg/day for those over 50. Higher supplemental calcium might raise the risk of kidney stones, and possibly cardiovascular disease and prostate cancer. Hypercalcemia can cause constipation, nausea, weight loss, fatigue, polyuria, and heart arrhythmias. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Calcium deficiency can reduce bone strength and lead to osteoporosis, causing fragile bones and increased risk of falling. It can also cause rickets in children and osteomalacia (defective bone mineralization and softening) in adults and children. Hypocalcemia signs include perioral numbness, tingling in hands and feet, and muscle spasms. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Groups most likely to have inadequate calcium include postmenopausal women, whose rises to 1,200 mg to lessen bone loss, and individuals who avoid dairy products, including people with lactose intolerance, those with milk allergy, and vegans, since dairy is a rich calcium source. — per the NIH Office of Dietary Supplements; general information, not medical advice.
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.
| ~40% |
| ~400 mg |
| calcium phosphate | ~38% | ~380 mg |
| calcium citrate | ~21% | ~210 mg |
| calcium lactate | ~13% | ~130 mg |
| calcium gluconate | ~9% | ~90 mg |
Elemental fractions are from standard molecular weights (rounded); real products vary by hydration and formulation — verify on the Supplement Facts panel.
Milk, yogurt, and cheese are rich natural sources of calcium, and in the United States about 72% of calcium intakes come from dairy products and foods with added dairy ingredients. Nondairy sources include canned sardines and salmon with bones as well as certain vegetables such as kale, broccoli, and Chinese cabbage (bok choi), while many fruit juices, milk substitutes (e.g., soy and almond beverages), tofu, and ready-to-eat cereals are fortified with calcium. Absorption from dairy products and fortified foods is about 30%, but it is much lower in plants high in oxalic acid such as spinach (only 5%) — per the NIH Office of Dietary Supplements.
The groups most likely to get inadequate amounts of calcium include postmenopausal women (whose declining estrogen reduces calcium absorption and increases bone loss) and individuals who avoid dairy products, such as people with lactose intolerance or milk allergy and vegans. Calcium deficiency can reduce bone strength and lead to osteoporosis, characterized by fragile bones and an increased risk of falling, and can also cause rickets in children and osteomalacia (defective bone mineralization and bone softening) in adults and children, although these are more commonly caused by vitamin D deficiency — per the NIH Office of Dietary Supplements.
Cost per serving
$0.45
PriceyCost per serving
$0.29
60 servings · ~60-day supply
Cost per serving
$0.19
Avg·−44%180 servings · ~180-day supply
Cost per serving
$0.12
Avg·−64%Cost per serving
$0.11
Avg·−65%Cost per serving
$0.75
Pricey40 servings · ~40-day supply
Cost per serving
$0.12
Avg·−62%Cost per serving
$0.08
Avg·−75%300 servings · ~300-day supply
Cost per serving
$0.08
Cheap·−75%130 servings · ~130-day supply
Cost per serving
$0.10
Avg·−69%100 servings · ~100-day supply
Cost per serving
$0.19
Avg·−46%100 servings · ~100-day supply
Cost per serving
$0.25
Avg·−35%60 servings · ~60-day supply
Cost per serving
$0.11
Avg·−68%180 servings · ~180-day supply
Cost per serving
$0.24
Avg·−37%50 servings · ~50-day supply
Cost per serving
$0.41
Pricey90 servings · ~90-day supply
Cost per serving
$1.78
Pricey13 servings · ~13-day supply
Cost per serving
$0.16
Avg·−50%120 servings · ~120-day supply
Cost per serving
$0.07
Cheap·−80%100 servings · ~100-day supply
Cost per serving
$0.98
Pricey90 servings · ~90-day supply
Cost per serving
$0.08
Cheap·−76%250 servings · ~250-day supply
Cost per serving
$0.32
Pricey90 servings · ~90-day supply
Cost per serving
$0.27
Avg·−32%Cost per serving
$0.22
Avg·−40%Cost per serving
$0.33
Pricey60 servings · ~60-day supply
Amazon.com · 🦴 Calcium
CPS
Price
$27.00
Amazon.com · 🧱 Boron
CPS
Price
$17.50
Amazon.com · 🦴 Calcium
CPS
Price
$34.99
Amazon.com · 🦴 Calcium
CPS
Price
$7.02
Amazon.com · 🦴 Calcium
CPS
Price
$6.82
Amazon.com · 🦴 Calcium
CPS
Price
$29.99
Amazon.com · 🦴 Calcium
CPS
Price
$22.17
Amazon.com · 🦴 Calcium
CPS
Price
$24.99
Amazon.com · 🦴 Calcium
CPS
Price
$10.79
Amazon.com · 🦴 Calcium
CPS
Price
$9.99
Amazon.com · 🦴 Calcium
CPS
Price
$18.54
Amazon.com · 🦴 Calcium
CPS
Price
$14.95
Amazon.com · 🦴 Calcium
CPS
Price
$18.97
Amazon.com · 🦴 Calcium
CPS
Price
$11.96
SuperSmart USA LLC · SuperSmart · 🦴 Calcium
CPS
Price
$37.00
Muscle Milk · Amazon.com · 🦴 Calcium
CPS
Price
$23.18
Amazon.com · 🦴 Calcium
CPS
Price
$18.99
Amazon.com · 🦴 Calcium
CPS
Price
$6.62
Amazon.com · 🦴 Calcium
CPS
Price
$88.00
Amazon.com · 🦴 Calcium
CPS
Price
$19.99
Amazon.com · 🦴 Calcium
CPS
Price
$29.00
Amazon.com · 🦴 Calcium
CPS
Price
$15.97
Amazon.com · 🦴 Calcium
CPS
Price
$25.97
Amazon.com · 🦴 Calcium
CPS
Price
$19.99
Yes. Calcium supplements can interact with dolutegravir (an HIV medication), levothyroxine (a thyroid hormone), and quinolone antibiotics, reducing their absorption or blood levels. Long-term lithium use with calcium supplements could increase hypercalcemia risk. Separate doses by hours and discuss your calcium status with your health care provider. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Horbäach Calcium Supplement with Vitamin D3 | 600 mg | 120 Softgels | Non-GMO… at $0.04 per serving — the lowest cost-per-dose calcium in our catalog. See the full ranking on the Best Calcium page.
We're tracking 64 active Calcium deals across Amazon US and partner retailers, ranked by community votes and cost-per-dose — not paid placement.
Across 64 tracked Calcium deals the median cost-per-dose is $0.158; the cheapest quartile comes in under $0.083 per serving. Anything below the median is a solid deal for the same molecule.
Deals are submitted by the community and ranked by net votes (hot minus cold) plus cost-per-dose normalised across container sizes. We take no affiliate kickbacks for ordering; sponsored slots, when present, are clearly badged.
Milk, yogurt, and cheese are rich natural sources of calcium, and in the United States about 72% of calcium intakes come from dairy products and foods with added dairy ingredients. Nondairy sources include canned sardines and salmon with bones as well as certain vegetables such as kale, broccoli, and Chinese cabbage (bok choi), while many fruit juices, milk substitutes (e.g., soy and almond beverages), tofu, and ready-to-eat cereals are fortified with calcium. Absorption from dairy products and fortified foods is about 30%, but it is much lower in plants high in oxalic acid such as spinach (only 5%) — per the NIH Office of Dietary Supplements.
Labels often show the calcium COMPOUND weight, not elemental calcium. By weight, calcium carbonate is about 40% elemental while gluconate is only about 9% — so a "1,000 mg gluconate" product delivers roughly 90 mg of elemental calcium. Compare the "Calcium" line in the Supplement Facts panel, not the front-of-bottle number.
Dosage, upper-limit, deficiency, food-source and interaction facts are sourced from the NIH Office of Dietary Supplements Calcium fact sheet. General information, not medical advice.
60 servings · ~60-day supply
60 servings · ~60-day supply
60 servings · ~60-day supply
180 servings · ~180-day supply
60 servings · ~60-day supply
120 servings · ~120-day supply
