Published on April 30, 2019

Have you tested your vitamin D lately? You may still be affected by deficiency resulting from this past winter!

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 deficiency compared to the winter time.

This chart was created from data presented in a 2008 paper from Melamed et al., 25-hydroxyl Vitamin D Levels and the Risk of Mortality in the General Population. The researchers analyzed vitamin D levels and mortality using health data of 13,331 adults from the National Health and Examination Survey (NHANES) III (1988 – 1994).

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Is your vitamin D level still affected by the winter low?

Seasonal trends have been observed in several diseases. In an effort to maintain a target serum level of 40-60 ng/ml (100-150 nmol/L) throughout the year, GrassrootsHealth recommends measuring the vitamin D serum level at the end of summer (late-September to early-October) and at the end of winter (late-March to early-April), and adjusting intake or vitamin D routine accordingly. Did you miss your winter test? Find out your level today! Log on to the shop (click the link below) to get your tests and see for yourself if your levels can be improved.

Make sure you track your results before and after, about every 6 months!

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How can I track my nutrient levels?

To help you track your nutrient levels, GrassrootsHealth has created an online tracking system called myData-myAnswers. You can also track your supplemental and dietary nutrient intake to see how they impact your nutrient levels. Check it out today!