The researchers
at UT Southwestern medical center, Dallas have reported that the absorptive
capacity of calcium citrate is better than calcium carbonate as it is efficient
in preventing osteoporosis in the initial stages of post-menopausal women. The
risk of reduced bone density is caused by the lack of calcium in the bones. The
experts say that calcium supplements taken at the right time will help prevent
loss of bone in aged people. Which form of calcium will prevent osteoporosis
and bone loss in early period of post menopausal women?
A few studies
compared the importance of calcium citrate over calcium carbonate and focused
on finding out which was absorbed properly. One of them was published in the
American Journal of Therapeutics in which the data were analyzed from 15 other
clinical trials evaluating the bio-availability of calcium. Bio-availability
refers to the amount of calcium that is absorbed from the supplement rather
than the amount present in the supplement.
Another study
was published in the Journal of Clinical Pharmacology by Dr. Howard Heller.
This study compared and investigated two calcium over-the-counter medications
called CitraCal or calcium citrate and Os-Cal or calcium carbonate. In this
study, the researchers concentrated on the pharmacokinetic properties of
calcium representing the gradual increase of blood calcium concentration in a
six hour period after a single oral dosage. This method was shown as better one
than evaluating the change in calcium level due to its excretion through urine.
Another study was also published in the American Journal of Therapeutics
explaining the ability of calcium citrate in ending the bone loss during the
early post-menopausal women.
All the above
research studies revealed and established the advantages of the calcium citrate
form of calcium supplementation. The results of the first study, which were
analyzed from 15 previous clinical trials indicate that calcium citrate was
absorbed by 22 to 27 percent better than calcium carbonate.
The second study
dealing with the commercial preparations of calcium identified that Citracal
was highly bio-available compared to Os-Cal. Hence, calcium citrate was
absorbed rapidly and to a large extent. The author in this study emphasized
that even in very favorable environment calcium citrate was better absorbed
than calcium carbonate. The researchers of this study could observe that the
extent of calcium citrate absorption was 2.5 times higher than calcium
carbonate.
In the third
study, the authors focused on the uses of calcium citrate in the initial stage
of post- menopausal women. In this study conducted for about two years, 57 women
in the early post- menopausal stage and six women of late post-menopausal stage
were taking calcium citrate medicines every day. These
women could stabilize the bone density in the spine, in the forearm and at the
top of the thigh bone as they were taking calcium citrate which can avoid bone
loss. The women in the same study taking placebo did not show any improvement
in the bone density and had a severe reduction in bone densities of spine and
forearm.
These studies
collectively convey the message that calcium citrate therapy alone can prevent
the bone loss in the early part of post-menopausal women. It is also found that
calcium citrate is effective for long period. In India the drug comes in several brands like
Calcinova Forte of Innova Formulations Private Limited.