For example, calcium is essential to strong bones. For millennia, the human diet included up to 2,000 mg of calcium daily. By contrast, current intake is often as little as 500-600 mg daily. This is nowhere near Canadian RDAs, which range from 700-1,500 mg daily. In fact, some experts believe current calcium RDAs are too low because they fail to account for factors that inhibit absorption and exacerbate loss, such as excessive consumption of caffeine, alcohol, or protein, and high levels of sodium or potassium.
Recent research shows that form to be calcium citrate malate.
Because bone tissue is constantly being broken down and regenerated, an ongoing supply of calcium is essential throughout our lives. It is especially important when we're young, because it enables us to achieve a healthy peak bone mass by the time our bones stop growing, between 20 and 30 years of age. And research suggests that a healthy peak bone mass can help ensure that we sustain healthy bones through out middle and older years, providing optimal protection against the debilitating effects of osteoporosis. Yet studies show that calcium deficiency at all ages is a serious public-health issue in industrial and developing nations alike. This makes it difficult to establish overarching daily requirements.