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Vitamin D Intake & Toxicity

Is your doctor telling you that you are taking too much vitamin D? The chart below, based on a review published by Hathcock et al., shows the incidence of vitamin D toxicity in relation to daily...

Serum Level vs Intake

Serum Level vs Intake Charts One of the most common questions we receive at GrassrootsHealth after an individual has tested their vitamin D is “How much vitamin D should I take to get my...

How to Choose a Daily Supplement Intake

September 16, 2015 We started GrassrootsHealth in 2007 by traveling the world and talking to vitamin D researchers. As you all know these researchers banded together to recommend everyone get their serum levels between...