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More to Health than Vitamin D

In working with participants from around the world, tracking their health and their vitamin D intake and levels, we have been able to report several positive health outcomes and benefits of having a vitamin...

Is Your Vitamin D Level Too High?

We sometimes receive questions from participants about whether a vitamin D test result is too high if it came back higher than the recommended range of 40-60 ng/ml. In this blog we will explore...

Can Vitamin D3 come from Plants?

Most of the vitamin D we have in our bodies is in the form of vitamin D3, which is synthesized in the skin upon exposure to sunlight and other forms of UVB radiation. Additional...

Tanning as a Source of Vitamin D

Two different research groups conclude the US RDA is off by an order of magnitude GrassrootsHealth scientists and staff have published a research letter, citing the D*action data, calling for the Institute of Medicine...

Vitamin D Testing Reduces Healthcare Costs

Researchers in Tennessee believed that vitamin D deficiency could lead to chronic ailments, which in turn increases health care costs. The Veterans Administration is interested not only in the health of their veterans, but...

Effect of BMI on Vitamin D Dose-Response

Evidence shows that vitamin D levels are affected by obesity. Using the data you provided for the GrassrootsHealth study, we assessed the effect of BMI on vitamin D dose-response. We found that with increasing...

Changes to Your Vitamin D Supplement Label

On May 27, 2016, the U.S. Food and Drug Administration (FDA) published new rules for Nutrition Facts labels that affect how labels read on vitamin D supplements and food products containing vitamin D. Two...