Calcium citrate supplements: what to know

It supplies calcium for functions including bone maintenance, muscle contraction, and nerve signalling. A supplement may be useful when food intake does not meet an individual's needs, but taking more products does not necessarily add benefit.

The front of a bottle may name calcium citrate, while the nutrition panel gives the elemental calcium supplied per serving. Elemental calcium is the figure used when adding intake from different supplements.

Calcium citrate can be taken with or without food. Combination products may also contain vitamin D or other nutrients, so compare ingredient lists to avoid unintentionally duplicating supplements.

Review your usual foods, fortified drinks, and current supplements before adding calcium citrate. Use the dose on the label unless a clinician has recommended a different plan, and do not combine products simply because their brand names differ.

Tell a pharmacist about thyroid medicine, iron, antibiotics, and other tablets because calcium may reduce their absorption when taken together. Get individual advice before use if you have kidney disease, kidney stones, high blood calcium, or a condition affecting the parathyroid glands.

During pregnancy or when planning pregnancy, review the full supplement list with a maternity clinician. Calcium does not replace folic acid or other nutrients recommended for a particular stage of care.

Constipation, bloating, or stomach discomfort can occur. Ask a clinician or pharmacist for advice if these effects persist, if swallowing the tablets is difficult, or if you are unsure how much calcium you receive from all sources.

Seek prompt medical care for severe weakness, repeated vomiting, confusion, marked thirst with frequent urination, or an irregular heartbeat. Call emergency services for trouble breathing or swelling of the lips, tongue, or throat.

Ask whether you need a supplement, which label amount should guide your choice, and whether any health condition changes the plan. Confirm how to space calcium citrate from prescribed medicines and whether your other products already contain calcium or vitamin D.