A 2007 study suggests higher vitamin D status enhances your immunity to microbial infections. They found that subjects with vitamin D deficiency had significantly more days of absence from work due to respiratory infection than did control subjects.
A 2009 study on vitamin D deficiency in newborns with acute lower respiratory infection (ALRI) confirmed a strong, positive correlation between newborns and mothers' vitamin D levels. Newborns with vitamin D deficiency appear to have an increased risk of developing ALRI, and since the child’s vitamin D level strongly correlates with its mother’s, the researchers recommend that all mothers optimize their vitamin D levels during pregnancy, especially in the winter months, to safeguard their babie's health.
A similar Indian study published in 2004 also reported that vitamin D deficiency in infants significantly raised their odds ratio for having severe ALRI.
The 2009 analysis of the Third National Health and Nutrition Examination Survey, which included 19,000 subjects over the age of 12, also found that higher vitamin D levels equated to lowered incidence of upper respiratory infections (URI).The correlation between lower vitamin D levels and increased risk of URI's was even stronger in individuals with asthma and chronic obstructive pulmonary disease.
Another 2009 report in the journal Pediatric Research stated that infants and children appear more susceptible to viral rather than bacterial infections when deficient in vitamin D. And that, based on the available evidence showing a strong connection between vitamin D, infections, and immune function in children, vitamin D supplementation may be a valuable therapy in pediatric medicine.
VITAMIN D DOSE RECOMMENDATIONS
Below 5 35 units per pound per day
Age 5 - 10 2500 units
Age 18 - 30 5000 units
Pregnant Women 5000 units
There is no way to know if the above recommendations are correct. The ONLY way to know is to test your blood. You might need 4-5 times the amount recommended above. Ideally your blood level of 25 OH D should be 60ng/ml.
I personally take 10,000 units per day in the winter.
Excellent food sources of antioxidants include:
Fruits: Cranberries, blueberries and blackberries
Vegetables: Beans, artichokes
Nuts: Pecans, walnuts and hazelnuts
Spices: Ground cloves, ground cinnamon and oregano