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The Effectiveness of Vitamin D Sprays

One of the questions we have received from our D*action participants is “Are vitamin D sprays as effective as other forms taken by mouth, such as pills and capsules?” This is a concern especially...

Where are GrassrootsHealth participants located?

More than 13,000 people worldwide have participated in the GrassrootsHealth study! In this blog series we will be taking a look at the characteristics of the GrassrootsHealth participants. Where are the GrassrootsHealth participants located?...

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...

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