A meta-analysis of 50 trials found a six percent lower mortality risk among people taking vitamin D3 and a two percent higher risk among those taking synthetic D2. Mercola argues D3 raises blood levels far more effectively and suggests adults need about 8,000 IU a day to reach 50-70 ng/ml.
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Vitamins
Research on vitamins A through K, deficiencies and supplementation.
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Vitamins
The Vitamin that has Been Shown to Dramatically Improve Fertility
Mercola summarises a European Journal of Endocrinology report that sun exposure lifts fertility in both sexes by raising vitamin D: in women by boosting progesterone and estrogen, in men by supporting sperm cell development, semen quality and testosterone.
Vitamins
New study suggests vitamin D deficiency linked to increased stroke risk
Dr. John Cannell reports on a Nutrition paper by Erin Michos and colleagues: whites with vitamin D below 15 ng/ml had threefold higher risk of fatal stroke, while no such link appeared among blacks. He also cites Alabama researchers finding more sunlight tied to fewer strokes.
Vitamins
This Vitamin Found to Rejuvenate Aging Eyes
Older mice given vitamin D3 for six weeks showed improved vision along with less retinal inflammation and amyloid beta buildup, University College London researchers found. Mercola suggests the results point toward macular degeneration prevention, though the work was done in mice.
Vitamins
Vitamin D deficiency common in elderly patients
German researchers measured vitamin D in 1,578 patients at a geriatric rehabilitation hospital in Trier and found 89 percent had insufficient levels and 67 percent were severely deficient. Low vitamin D can weaken muscles and raise the risk of falls and fractures in older people.
Vitamins
Vitamin D supplements given away (PR)
The Vitamin D Council and Bio-Tech Pharmacal are giving away bottles of 4,000 IU vitamin D3 capsules to organizations that can use between 100 and 400 bottles and will use them to educate their communities about vitamin D. Applications close February 10.
Vitamins
Vitamin D and fertility in men and women
John Cannell points to a systematic review in the European Journal of Endocrinology concluding that vitamin D's possible role in reproduction warrants research into supplementation for fertility disorders, and notes male factors underlie 30 to 40 percent of infertile couples.
Vitamins
Research From 100 Countries Proves This Vitamin Strongly Protects Against Cancer
Dr. Mercola reports on a review of data from more than 100 countries in which higher solar UVB exposure consistently tracked with lower incidence of 15 cancers, with weaker evidence for nine more, and urges sun exposure or vitamin D3 plus blood testing to confirm levels.
Vitamins
Vitamin D helps asthma, eczema, but optimal dose unclear - review
Reviewing recent research, Augusto Litonjua reports that low vitamin D levels mostly track with higher asthma and allergy risk, though a few studies found the reverse, and that small short-term trials suggest supplements ease eczema and asthma flares. The optimal level stays unclear.
Vitamins
Vitamin D deficiency may increase risk of type 2 diabetes mellitus - study
Analyzing 12,263 Koreans from a 2008-2009 national survey, researchers found people with serum 25-hydroxyvitamin D below 25 nmol/L were 76% more likely to have type 2 diabetes than those above 75 nmol/L, with 21% and 34% increases at middle levels.
Vitamins
Another Rickets Tragedy
John Cannell of the Vitamin D Council publishes an email from a mother whose two-month-old, breastfed without vitamin D supplements, began twitching and was hospitalized; she and her fiance now face child abuse charges. Cannell says he cannot know, but guesses they are innocent.
Vitamins
Response to CRP and vitamin D association finding from Vitamin D Newsletter
The Vitamin D Council answers Johns Hopkins researchers who reported that levels above 20 ng/ml raise the inflammation marker CRP. It notes their adjusted figures show CRP near 1.7 at 20 ng/ml versus 1.9 at 50, while their raw data show vitamin D reducing CRP in the lower ranges.
Vitamins
Low prenatal vitamin D linked to high risk for type 1 diabetes in children
Norwegian researchers compared 109 women whose children developed type 1 diabetes before age 15 with 219 control mothers, and found those in the lowest quartile of serum vitamin D more than twice as likely to have an affected child. They call for a randomized trial.
Vitamins
Vitamin D could help combat the effects of aging in eyes (PR)
UCL researchers gave vitamin D to old mice for six weeks and saw reduced inflammation, partly cleared retinal debris and improved vision. They hope this might mean supplements could help against age-related eye disease such as macular degeneration in people.
Vitamins
Vitamin C helps diabetes patients
A 12-week double-blind trial of 70 type 2 diabetes patients in India found that those adding vitamin C to metformin ended with higher plasma ascorbic acid and better fasting glucose, post-meal glucose and HbA1c than patients on the drug alone.
Vitamins
70 percent of Europeans suffer from low vitamin D levels (PR)
Blood levels of vitamin D are low in 50 to 70 percent of Europeans, and a group of European Menopause and Andropause Society experts led by Faustino Perez-Lopez has issued a report on supplementation for postmenopausal women, calling for levels above 30 ng/ml.
Vitamins
Vitamin D may improve bone health in those taking anti-HIV drug (PR)
In an NIH network study of adolescents being treated for HIV, large monthly doses of vitamin D lowered blood levels of a hormone that draws calcium out of bone, suggesting a way to counter tenofovir's effect on bone density. The findings appeared in Clinical Infectious Diseases.
Vitamins
Could vitamin D boost your testosterone?
A Clinical Endocrinology study found men in the highest quintile of blood vitamin D had 8 percent higher total testosterone than those in the lowest, with the association flattening above roughly 75 to 85 nmol/L. The authors say the causality and direction remain unresolved.
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