Moderate exercise promotes calcium where as heavy exercise hinders calcium uptake. Insufficient vitamin D intake, or excessive amounts of phosphorus and magnesium hinder the uptake of calcium. Taking calcium with iron reduces the effect of both minerals. Too much calcium can interfere with zinc, and too much zinc can interfere with calcium. A hair analysis can be done to determine the levels of these minerals.
Calcium supplements are more effective when taken in smaller doses throughout the day.
When taken before bed it promotes a sound sleep. Also meats, refined grains, soft drinks, alcoholic beverages, coffee, junk foods, excess salt, and white flour lead to loss of calcium by the body. Almonds, beet greens, cashews, chard, cocoa, kale, rhubarb, soybeans, and spinach all interfere with calcium absorption. The number of electrolytes in the body also effect calcium absorption. Calcium my also interfere with those on calcium channel blockers prescribed for heart problems and high blood pressure.