The result of the calculation is only an estimate, not an exact measure of calcium intake as not all foods containing calcium are included in the table. Certain groups of people may not be able to obtain sufficient calcium through their diet, for example elderly persons with reduced appetite, low activity levels or medical conditions, and if this is the case supplements may be required upon a doctor's recommendation.

See section covering issues related to calcium and vitamin D sufficiency in the elderly. In patients diagnosed with osteoporosis and receiving a drug treatment, calcium and vitamin D supplements are also usually prescribed, to ensure adequate intakes, and maximum effectiveness of the drug therapy. The types of supplements available vary by country, so people should consult with their medical practitioner for the one best suited to their individual needs, as well as when to take them, and whether or not to combine them with food, medication or other supplements.

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