NOW Calcium Citrate, 8-Ounces (Pack of 3)
$26.56
Price Per Absorbed Gram: 0.5533
#10 of 82 products in Calcium
| Top 5 Products | Compound | Price Per Absorbed Gram |
| BulkSupplements.com Calcium Gluconate Powder - Calcium Supplement - Calcium Powder - Bone Supplements - Gluconate Powder - Gluconate Calcium Supplement - Calcium without Vitamin D (250 Grams - 8.8 oz) | Calcium Gluconate | 0.2792 |
| Tums Ultra Strength 1000 Assorted Berries Chewable Tablets 160 Count | Calcium Carbonate | 0.3325 |
| 21st Century Calcium 500 mg Plus D3 Tablets, 400 Count | Oyster Shell Calcium | 0.3330 |
| Oyster Shell Calcium Tablets, 500mg, 1000ct | Oyster Shell Calcium | 0.3871 |
| Kirkland Signature Calcium Citrate 500mg (500 Tablets) | Calcium Citrate | 0.4011 |
#2 of 15 products in Calcium Citrate
Now Foods
Pure Powder Highly Bioavailable Calcium Enhanced Mixability GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation). Packaged in the USA by a family owned and operated company since 1968. During the summer months products may arrive warm but Amazon stores and ships products in accordance with manufacturers' recommendations, when provided.
Calcium Citrate may be less likely to cause kidney stones
Calcium citrate is less likely to form stones because it is absorbed in the stomach and intestines, rather than the kidneys. This means that there is less calcium in the urine, which reduces the risk of stone formation. Additionally, Calcium citrate may also help to reduce the risk of kidney stones by binding to oxalate in the gut. It's also important to note that taking a high dose of calcium citrate or any other form of calcium may increase the risk of kidney stones, therefore it's important to take the recommended dosage.
Calcium is Important for the Heart, Muscles, and Nerves
In the heart, calcium is needed for the proper contraction and relaxation of the heart muscle. It also plays a crucial role in the electrical impulses that control the heartbeat. If there is an imbalance of calcium in the body, it can lead to muscle cramps and spasms, which can be painful. A deficiency of calcium can lead to nerve problems such as tingling, numbness, and muscle weakness. Calcium is involved in the transmission of electrical impulses along nerve fibers.
Calcium and Iron Can Interact and Negatively Affect the Absorption of Each Other
This is because calcium and iron (and Zinc) compete for the same absorption sites in the gut, and when there is a high level of calcium present, it can reduce the amount of iron that is absorbed. To minimize the interaction between calcium and iron, it is recommended to take them at different times of the day, with a gap of 2-3 hours in between. It's also recommended to take iron supplements on an empty stomach, as food can also interfere with iron absorption
Recommended Dietary Allowance
The Recommended Dietary Allowance (RDA) is “the amount of an essential nutrient, as a vitamin or mineral, that has been established by the Food and Nutrition Board of the National Academy of Sciences as adequate to meet the average daily nutritional needs of most healthy persons according to age group and sex.” –- dictionary.com
We used the RDA for calcium from the National Institutes of Health – Office of Dietary Supplements listed below.
| Age | Male Daily |
| 0-6 months | 200 mg |
| 7-12 months | 260 mg |
| 1-3 years | 700 mg |
| 4-8 years | 1,000 mg |
| 9-18 years | 1,300 mg |
| 19-50 years | 1,000 mg |
| 51-70 years | 1,000 mg |
| 71+ years | 1,200 mg |
| Age | Female Daily |
| 0-6 months | 200 mg |
| 7-12 months | 260 mg |
| 1-3 years | 700 mg |
| 4-8 years | 1,000 mg |
| 9-18 years | 1,300 mg |
| 19-50 years | 1,000 mg |
| 51+ years | 1,200 mg |
| Life State | Age | RDA |
| Pregnancy | 13-19 years | 1,300 mg |
| Pregnancy | 20+ years | 1,000 mg |
| Breast-Feeding | 13-19 years | 1,300 mg |
| Breast-Feeding | 20+ years | 1,000 mg |