A review links high calcium intake from food and supplements to advanced or fatal prostate cancer. Among 783 black men, those reporting the highest calcium intake were twice as likely to have localized and advanced disease, and genotype appeared to shape how much the risk rose.
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Calcium
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Vitamins
Calcium/vitamin d supplements may boost risk of urinary tract stones
In the Women's Health Initiative, 36,282 postmenopausal women took 500 mg of calcium carbonate plus 200 IU of vitamin D3 twice daily or a placebo for seven years. The supplement group was 17% more likely to report urinary tract stones, 449 cases against 381.
Minerals
Potassium, magnesium reduces stroke risk in hypertensive women
Among 34,670 Swedish women followed 10.4 years, those with hypertension who ate the most potassium had 36 percent fewer strokes overall, and the most magnesium 37 percent fewer cerebral infarctions. Hypertensive women eating the most calcium were twice as likely to suffer intracerebral hemorrhage.
Vitamins
Calcium and vitamin D: Is it heart smart ?
A BMJ reanalysis of the Women's Health Initiative calcium and vitamin D trial, pooled with eight other studies, reports that calcium supplements with or without vitamin D can raise the risk of cardiovascular events such as heart attack. The original trial of 36,282 women found no such rise.
Minerals
Calcium rich foods
A USDA appendix ranking non-dairy calcium sources by milligrams per standard serving, from fortified cereals and calcium-fortified soy beverage through sardines, tofu, canned salmon, collards and blackstrap molasses. The table notes that bioavailability varies between foods.
Comments
The "Calcium Lie" Every Woman Should Know About
Mercola cites Robert Thompson's book The Calcium Lie, which holds that bone is made of at least a dozen minerals and that focusing only on calcium supplements may worsen bone density. Thompson recommends unprocessed salt instead, and Mercola questions drugs such as Fosamax, Actonel and Boniva.
Minerals
Calcium supplements versus myocardial infarction: What you need to know
University of Auckland researchers pooled more than a dozen trials and epidemiological studies covering 11,921 participants followed about four years, and found people taking calcium supplements were 30 percent more likely to suffer a heart attack. None of them took vitamin D alongside the calcium.
Vitamins
Calcium, Vitamin D used Together Cut Fracture Risk
A Copenhagen meta-analysis of seven trials covering 68,517 people averaging age 70 found vitamin D alone did not change fracture risk, while vitamin D with calcium cut overall fractures 8% and hip fractures 16%. The authors disclosed fees from major drug makers.
Vitamins
Vitamin D and Calcium Act Jointly to Prevent Cancer
Peterlik and colleagues argue in Anticancer Research that vitamin D and calcium jointly regulate cell growth, listing three ways 1,25-dihydroxyvitamin D3 and extracellular calcium interact, and suggest the two may work better taken together than alone.
Minerals
Is calcium supplementation effective?
Dr. Robert Thompson argues calcium supplements create a mineral imbalance that can lower bone density. A Women's Health Initiative study of 36,282 women found only a 1 percent hip gain; lead author Elizabeth Nabel still recommends continuing, while others cite kidney stone risk.
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