Bone and teeth
Most body calcium is stored in bones and teeth.
Calcium
MineralCalcium helps build bones and teeth and is also used for muscle contraction, nerve signaling, blood clotting, and cell communication.
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What it is
What Is Calcium?
Calcium helps build bones and teeth and is also used for muscle contraction, nerve signaling, blood clotting, and cell communication.
You do not need to memorize a nutrient chart. The useful part is knowing where it shows up in food, roughly how much you need, and what that can look like on an actual plate.
What the body uses it for
What Calcium Actually Does
Muscle contraction
Calcium ions participate directly in muscle contraction.
Nerve transmission
Calcium is involved in neurotransmitter release and cell signaling.
Blood clotting
Calcium is required in several steps of the coagulation process.
How much you need
How Much Do You Need?
Recommended amounts depend on the nutrient, age, sex, and life stage. Some compounds do not have an established Dietary Reference Intake.
Use the authoritative source below for the current RDA, AI, upper limit, or other guidance that applies to Calcium.
See current intake guidance →Food sources
Where Calcium Shows Up in Food
You do not need to memorize this list. These are everyday examples of foods that can contribute Calcium. Amounts can change with serving size, variety, preparation, and fortification.
Milk and yogurt
Fortified plant beverages
Sardines with bones
Calcium-set tofu
Kale and bok choy
Food composition reference: USDA FoodData Central.
Make it useful
What Does That Look Like on a Plate?
Knowing what is in your food is useful. Knowing what to do with it is better. Pick a food. Find a recipe. See what you already have. Plan the meal. Buy what is missing. Then go eat food.
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A little context matters
When More Isn't Better
Calcium needs vary by age and life stage. Large supplemental doses can cause gastrointestinal effects and can interact with some medicines; kidney-stone risk and medical history may also matter.
Food and supplements are not the same thing. Supplements can deliver much larger doses. Medications, pregnancy, kidney or liver function, allergies, and other health circumstances can change what is appropriate.
Evidence & trusted sources
Where This Information Comes From
NIH Office of Dietary Supplements – CalciumPrimary nutrient reference
USDA FoodData CentralFood composition and nutrient data
Evidence last reviewed: October 2026
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