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Why the Optimal Vitamin D Range May Be Higher

Could limiting vitamin D recommendations unintentionally limit the full spectrum of its health benefits? Key Points Optimal vitamin D levels may extend beyond the recommended 40–60 ng/mL range, with emerging evidence supporting a broader...

Who Is Most at Risk of Vitamin D Deficiency?

11 Key Factors That Influence Your Vitamin D Levels Key Points Vitamin D deficiency risk varies widely between individuals due to differences in sun exposure, lifestyle, biology, and overall health status. Certain factors—including limited...

Effects of Vitamin D on the Immune System

Learn more about exactly how vitamin D affects our immune cells and their response to infection Key Points Vitamin D plays a central role in immune defense by activating genes that enable immune cells...

Help Expand the Impact of Vitamin D Research

A New Phase for GrassrootsHealth — Do You Know Someone Who Could Help Support Our Work? Key Points GrassrootsHealth is expanding its initiatives, including the updated CheckYourD platform, practitioner education programs, and new digital...

Vitamin D, Genetics, and Cardiovascular Disease Risk

Your Genes, Your Nutrients, and Your Heart: How Nutrigenetics Is Reshaping Cardiovascular Health Key Points Vitamin D deficiency, obesity, and cardiovascular disease are deeply interconnected, meanwhile decades of research show that optimal vitamin D...

FLASH SALE - THIS WEEKEND ONLY! Save 20% on select test kits when measuring essential & toxic elements. Sale ends Monday 6/22/2026

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