I have written about this, mentioned it more than once on my radio show and commented on this matter on Twitter, LinkedIn and Facebook.
Simply put, I can see no reason, other than a laboratory demonstrated calcium deficiency -- typically a sign of other disease -- that anyone should be supplementing their diet with calcium liquid, chewables or pills.
Taking calcium does not, in and of itself, treat or prevent osteoporosis or osteopenia (loss of calcium and strength in the bone), no matter the cause. Calcium does not grow stronger teeth. Do you need calcium? Yes you do, but not as a supplement!
I advise my patients who are planning surgery to quit supplements and any natural product- even natural teas at least a week or 10 days BEFORE surgery. Natural products are biologically active and COULD adversely affect your surgery and its outcome. Excessive bleeding is a big concern. I do not think that we really know to what extent supplements and natural products can play a detrimental role before, during or after surgery, but why would you take the risk? Here are some commonly used natural products that you should be very cautious about when going for surgery:
There was a small study of patients with hypertension (high blood pressure) who belong to a genotype found in 10% of the world population- many of whom are from Northern China (20%) and Mexico (32%). In a small but well done study their blood pressures were reduced with a small dose of Vitamin B2 (Riboflavin). The drop could be enough on its own, but it could bring blood pressures into the normal range with medications where before it was difficult to get enough control. First, it may be worth discussing this with your health care provider. If you are having trouble controlling your blood pressure with medications, there are MANY possible reasons, but a trial of B2 (remember small dose or through your diet) is not unreasonable to see if it helps.
This brings up another topic. I recommend Genetic Geneology. How did we end up where we are today? Where did you really come from? DNA studies have shown that people shared a common ancestor who lived in Africa between 50,000 to 200,000 years ago. As our ancestors migrated out of Africa into the rest of the world, small changes called mutations occurred in their DNA. As generations passed, each mutation links our ancestor to a specific time and place in history. The mutations that we find in our own DNA tell the story of our own ancestral past.