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Our assessment

Our assessment: The evidence shows that calcium is a well-studied mineral, but it requires careful management. For the general adult population, the recommended daily allowance is 1,000 mg, increasing to 1,200 mg for women over 50 and men over 70 [NIH ODS]. You should be aware that while calcium is essential for bone health, taking more than needed does not provide extra benefit and may introduce risks.

How it works

Think of calcium as a structural building block and a cellular messenger. It supports bone density and mineral deposition, which is critical for maintaining strong bones [NIH ODS]. Additionally, calcium plays a key role in neuromuscular relaxation, helping your muscles relax and your nerves signal properly [NIH ODS]. This dual role makes it vital for both your skeleton and your daily physical function.

Safety profile

The FDA received a total of 592,059 adverse event reports across all supplement categories. For calcium specifically, high intakes from supplements might increase the risk of heart disease and prostate cancer [NIH ODS]. Very high blood calcium levels can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Data not available for this specific product's side effect report count.

Our recommendation

Our recommendation: If you are considering this calcium supplement, first assess your dietary intake from food sources like dairy, leafy greens, and fortified foods. Do not exceed the RDA without a healthcare provider's guidance. Take calcium supplements with food and separately from the medications listed above by at least 2 hours [NIH ODS]. For most people, getting calcium from food is safer than from high-dose supplements [NIH ODS].

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide