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Happy Vitamin D Day!

To celebrate Vitamin D Day, we are releasing our new Vitamin D Deficiency Risk Assessment Quiz, an eTool to help provide everyone personalized education about vitamin D Key Points November 2nd is Vitamin D...

Celebrating 15 Years with 15% Off Everything

For this 15 year anniversary, we celebrate all we have achieved together with you, our scientists, supporters, and participants. Join us now if you haven’t already! 15 YEARS AGO… In 2007, as GrassrootsHealth’s Founder...

The CO-VID D-Lemma: A Call for Action

AND, the Vitamin D & COVID-19 Research Review eBook is now available; share it along with Dr. Michael Holick’s call to action for vitamin D and COVID-19 Key Points The use of sunshine and...

The BIG Mistake by the IOM

Video Friday: The math and science used to determine recommended vitamin D serum levels and supplementation amounts, and where the IOM got it wrong It’s Video Friday! Today’s video titled What Serum Level Should...

Sunshine Month Flash Sale! Get 20% off test kits and a free eBook! Use code SUNFLASH25. Offer ends Sunday, May 11th, 2025 at 11:59PM PST (Not valid on sale items or the T1D Prevention Test Kit)

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