Iron deficiency is one of the most common nutrient deficiencies worldwide, because iron is difficult to get and absorb in the proper amount from the diet alone (Taber's Cyclopedic Medical Dictionary). Iron is essential for hemoglobin formation and for the effective circulation of oxygen throughout the body. Without adequate levels of iron in the blood one will be left feeling tired. Women are more likely to suffer from anemia and low blood-iron because menstruation, pregnancy and breastfeeding tax their iron stores.

Vegetarians are at risk and so are those who eat little red meat because red meat is the highest dietary source of iron. Seniors often require an iron supplement due to decreased nutrient absorption.

Do Calcium and Iron really interfere with the absorption of the other?

Yes. The reason is that they are competing for the same absorption sites in the small intestine.  This can be confusing, since both are present in spinach, and other vegetables; however, it must be remembered that they are not present in high amounts in food, so there are probably enough absorption sites to absorb both.

In a supplement however, the doses are high and so the maximum absorption sites are needed by each nutrient. These two minerals can be taken 2 hours apart from each other. If it is calcium carbonate, it needs to be taken with food to increase its absorption.

However, our calcium tonic does not require that, because it already has good absorption rates. Calcium actually interferes with absorption of many nutrients so it is best taken alone away from other supplements. Best taken at bedtime, because it helps induce sleep.

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