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Our assessment

The evidence shows that calcium is a critical mineral for bone health, but the data also reveals important risks that you need to understand before supplementing. Our assessment is that calcium supplementation is not right for everyone, and you should approach it with caution, especially if you have a history of kidney stones or heart concerns [NIH ODS].

How it works

Think of calcium as the structural building block for your bones and teeth. It supports bone mineralization and density, and it also plays a role in neuromuscular relaxation, helping your muscles and nerves signal properly [NIH ODS]. Without enough calcium, your body will pull it from your bones, which can weaken them over time.

Safety profile

FDA received 592,059 total adverse event reports across all supplements, though specific report counts for calcium alone are not available. The data shows that high calcium intakes might increase the risk of heart disease and prostate cancer. High levels of calcium 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 [NIH ODS] [FDA data].

Our recommendation

We recommend getting your calcium from food first, as the data shows significant risks with high-dose supplements. If you do choose a supplement, take it with food and avoid exceeding the tolerable upper intake level. Be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Speak with your doctor to determine if supplementation is appropriate for you.

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