gorham deficiency by season

Vitamin D Deficiency by Season

  The chart below demonstrates the profound influence that season can have on vitamin D levels and risk of deficiency. During the summertime, for example, there is a 70% decreased risk of vitamin D...

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Vitamin D Does Not Cause Kidney Stones

One of the misconceptions about vitamin D is that increased vitamin D levels can increase the risk for kidney stones. Upon examination of the D*action population, GrassrootsHealth was able to show an opposite effect....

Sunshine-Calendar

Sunshine Calendar

Vitamin D comes from the synthesis of UVB radiation, which is less than 5% of the sunshine. Depending on the time of day and time of year, there may not be enough UVB to...

graph cold flu for web

Vitamin D Reduces Colds and Flu

In the GrassrootsHealth questionnaire that accompanies D*action, participants are asked whether they had a cold or flu in the previous 6 months. What can we learn from this data? 33% of D*action participants experienced...

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Most Common Omega-3 Supplementation

We asked the first 77 participants in D*action+Omega-3 about their supplementation habits: 83% of participants report taking an Omega-3 supplement (14% take >1) The most popular brand is Mercola Krill Oil (23%) A majority take...

toxicity

Vitamin D Intake & Toxicity

Is your doctor telling you that you are taking too much vitamin D? The chart below, based on a review published by Hathcock et al., shows the incidence of vitamin D toxicity in relation to daily...