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- Formation of bone and teeth
- Muscle contraction
- Normal functioning of many enzymes
- Blood clotting
- Normal heart rhythm

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Dairy products
Fish with edible bones
Almonds
Green vegetables

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- Regulated by parathyroid hormones (PTH) and calcitonin
- Calcium combines with other minerals to form hard crystals that give your bones strength and structure

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- Poor growth in children
- The decrease in bone mass increase risk of developing osteoporosis when older
- Increased risk of hypocalcemia
- Minor symptoms: numbness, tingling fingers, muscle cramps, lethargy, poor appetite, weak or brittle fingernails, difficulty swallowing, fainting.