Calcium supplements  increased BMD by 0.7 - 1.8 % at all five skeletal sites at one , two , and over two and a half years , but the size of the increase in BMD at later time points was similar to the increase at one year .
Increasing calcium intake from dietary sources or by taking calcium supplements produces small non-progressive increases in BMD , which are unlikely to lead to a clinical ly significant reduction in risk of fracture
OBJECTIVE To determine whether increasing calcium intake from dietary sources affects  bone mineral density ( BMD ) and , if so , whether the effects are similar to those of calcium supplements .
Heated oyster shell-seaweed calcium (AAA Ca) on osteoporosis
A r and omized , prospect i ve , double-blind test was carried out to compare the effects of heated oyster shell-seaweed calcium ( AAA Ca ) , calcium carbonate , and placebo in 58 elderly , hospitalized women with the mean age of 80 divided into three groups . Group A received 900 mg/day Ca as AAA Ca , Group B 900 mg/day Ca as CaCO3 , and Group C placebo besides regular hospital diet containing approximately 600 mg Ca/day for 24 months . From the 25th to the 30th month , all groups were given AAA Ca .  Lumbar spine and radial bone mineral density ( BMD ) were measured at 3-month intervals . Urinary Ca/Cr and serum alkaline phosphatase , intact and midportion serum parathyroid hormone ( PTH ) , and calcitonin were also measured at intervals . From the 6th to the 24th month of the study , the ratio of lumbar spine BMD ( L2–L4 by DPX , Lunar ) to the basal pretest value was consistently and significantly higher in Group A than Group C but not higher in Group B than in Group C. PTH , measured 12 months after the beginning of the study , was lower in Group A than in Group C , but no significant difference was found between Groups B and C. At 3 months after the placebo was switched to AAA Ca in Group C , serum PTH was significantly decreased from the level during placebo supplement . Morning urine Ca/Cr decreased in Groups A after 18 months and in B after 12 months , but not in C. Serum alkaline phosphatase decreased in Group A significantly compared with Group C , but not in Group B. AAA Ca appears to be effective for increasing BMD in elderly subjects
Calcium supplements  increased BMD by 0.7 - 1.8 % at all five skeletal sites at one , two , and over two and a half years , but the size of the increase in BMD at later time points was similar to the increase at one year .
Increasing calcium intake from dietary sources or by taking calcium supplements produces small non-progressive increases in BMD , which are unlikely to lead to a clinical ly significant reduction in risk of fracture
OBJECTIVE To determine whether increasing calcium intake from dietary sources affects  bone mineral density ( BMD ) and , if so , whether the effects are similar to those of calcium supplements .