Calcium Supplements
Calcium is the most abundant mineral in the human body, with approximately 99% stored in bones and teeth. Beyond its structural role in skeletal health, calcium is essential for muscle contraction, nerve transmission, blood clotting, and hormone secretion. Adequate calcium intake throughout life is a key factor in maintaining bone density, particularly as the body's ability to absorb calcium from food can decline with age.
At Best Vitamins Online, we carry calcium supplements from professional-grade brands including Bluebonnet Nutrition, NOW Foods, Pure Encapsulations, Douglas Laboratories, and more. From calcium citrate and carbonate to combination formulas with Vitamin D3, K2, and magnesium, we offer the full range of options to support your bone health goals.
Calcium Forms & Their Differences
- Calcium Citrate — Does not require stomach acid for absorption; well-tolerated and can be taken with or without food; preferred for older adults and those with low stomach acid
- Calcium Carbonate — The most concentrated form by elemental calcium content; requires stomach acid for absorption and is best taken with meals
- Calcium Malate — A highly soluble chelated form with good bioavailability
- Microcrystalline Hydroxyapatite (MCHA) — A whole-food-derived form from bone matrix; contains calcium alongside other bone-supportive cofactors
- Calcium + Vitamin D3 Combinations — Vitamin D3 is required for calcium absorption; combination formulas provide both in a single supplement
- Calcium + Magnesium + D3 + K2 — Comprehensive bone support formulas combining the key nutrients that work together in bone metabolism
Top Calcium Brands
- Bluebonnet Nutrition — Non-GMO calcium citrate, carbonate, and combination formulas
- NOW Foods — Wide range of calcium forms including citrate, carbonate, and calcium+magnesium blends
- Pure Encapsulations — Hypoallergenic calcium citrate and combination formulas
- Douglas Laboratories — Practitioner-trusted calcium and bone support formulas
- Metagenics — Professional-grade calcium and bone health formulas
Related Categories
- Vitamin D Supplements — Essential for calcium absorption; frequently combined with calcium
- Vitamin K Supplements — K2 MK-7 helps direct calcium to bones rather than soft tissues
- Magnesium Supplements — Works synergistically with calcium in bone and muscle function
- Mineral Supplements — Browse all minerals including zinc, iron, and trace minerals
Frequently Asked Questions
What is the difference between calcium citrate and calcium carbonate?
Calcium citrate does not require stomach acid for absorption and can be taken with or without food, making it a good choice for older adults or those taking acid-reducing medications. Calcium carbonate has a higher elemental calcium content per tablet but requires stomach acid to dissolve properly and should be taken with meals.
How much calcium should I take daily?
The recommended dietary allowance (RDA) for calcium is 1,000–1,200 mg per day for adults, depending on age and sex. It is generally recommended to get as much calcium as possible from food and use supplements to fill remaining gaps. Splitting doses of 500 mg or less improves absorption efficiency.
Should I take calcium with Vitamin D?
Yes. Vitamin D3 is required for the intestinal absorption of calcium. Without adequate Vitamin D, the body cannot efficiently absorb dietary or supplemental calcium regardless of intake. Many calcium supplements include Vitamin D3 for this reason.
Why is Vitamin K2 included in some calcium formulas?
Vitamin K2 (MK-7) activates proteins that help direct calcium into bones and teeth rather than depositing in arteries or soft tissues. When taking higher doses of Vitamin D3 and calcium, many practitioners recommend including K2 as part of a comprehensive bone support protocol.
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