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Our assessment

The evidence shows that calcium is a critical mineral for bone health, but supplementation carries important risks you need to understand. Our assessment is that most adults should prioritize getting calcium from food before turning to supplements, as high intakes from pills are linked to serious health concerns [NIH ODS].

How it works

Think of calcium as a builder and messenger in your body. It supports bone density and mineral deposition — think of it as laying down the structural framework for your skeleton. Calcium also plays a key role in neuromuscular relaxation, meaning it helps your muscles relax and your nerves signal properly after they've been activated [NIH ODS].

Safety profile

From a safety standpoint, the data requires caution. FDA received 592,059 total adverse event reports across all supplements. For calcium specifically, some research suggests that high 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]. Additionally, calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Do not exceed the Tolerable Upper Intake Level without medical supervision. Start by evaluating your diet — dairy, leafy greens, and fortified foods are excellent sources. If you must supplement, take calcium with food and separate it from medications like thyroid hormone or antibiotics by at least 2 hours. Always consult your doctor before starting, especially if you have a history of kidney stones or heart disease [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