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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...