The more refined forms tend to eliminate lead during processing. Asthma potentiates phospholipase A2, which breaks down cell membranes and releases arachidonic acid. This eventually converts into leukotrienes of the 4 series, which have tremendous bronchoconstriction effects. Citrate forms of calcium actually inhibit stone formation. Excess thyroid hormones, specifically T4, have been shown to cause bone loss if given inappropriately by causing excessive excretion of calcium.
Tetracyclines inhibit calcium absorption and vice versa.
Corticosteroids are well known to cause osteoporosis and calcium loss. Calcium may be a factor in magnesium, iron and zinc deficiency if given in high doses. It may also interfere with other minerals such as manganese. Reprinted with permission. Reprinted with permission.