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Our assessment

The evidence shows that calcium is a foundational mineral for bone health, but it is not without risks. Our assessment is that you should approach calcium supplementation carefully, prioritizing dietary sources first. The data indicates that high intakes may increase the risk of heart disease and prostate cancer [NIH ODS].

How it works

Think of calcium as a structural builder for your bones and a signal regulator for your muscles and nerves. It supports bone density and mineral deposition, and it is essential for muscle relaxation and nerve signaling [NIH ODS].

Safety profile

FDA received 592,059 total adverse event reports for this product category, though this number covers all ingredients in the formulation. For calcium specifically, high levels in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [FDA data] [NIH ODS]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Start by getting calcium from food sources like dairy, leafy greens, or fortified products. If you need a supplement, take it with food and separate it from your thyroid or antibiotic medications by at least 4 hours. Do not exceed the recommended daily intake without consulting your healthcare provider, as high levels carry significant risks [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