In our last post about magnesium, we discussed magnesium intake and the high proportion of the population whose intake from the diet is well below the recommended daily intake level. Today, we will talk...
When taking and/or prescribing higher doses of vitamin D, it might be useful to know the likelihood of achieving a vitamin D serum level on the higher end of the 25(OH)D serum level spectrum,...
Omega-3 status can be assessed by measuring the amount of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in red blood cells, which is called the Omega-3 Index. The primary food source of EPA and...
In 2017, GrassrootsHealth expanded the supplement section on their health questionnaire to include nineteen nutrients. Today, we will provide a summary of what we found so far about supplement use among GrassrootsHealth participants. What...
There was a song that was on a 78 record that I had as a child, The Churkendoose (yes, I’m really that old..) Well It depends upon, begins and ends upon, It depends on...
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...
This figure shows a plot of the 25(OH)D values as a function of reported vitamin D intake amounts. The black dotted line is the best fit line through the data, the blue lines...
Serum Level vs Intake Charts One of the most common questions we receive at GrassrootsHealth after an individual has tested their vitamin D is “How much vitamin D should I take to get my...
September 16, 2015 We started GrassrootsHealth in 2007 by traveling the world and talking to vitamin D researchers. As you all know these researchers banded together to recommend everyone get their serum levels between...
SAN DIEGO, CA (March 18, 2015) – Researchers at UC San Diego and Creighton University have challenged the intake of vitamin D recommended by the National Academy of Sciences (NAS) Institute of Medicine (IOM),...