Test Vitamin D
FEATURING ZRT LABORATORY TESTING!
Reliable, Accurate, Easy-to-Use!
TEST WITH CONFIDENCE
Blood Spot Test Advantages
Blood spot testing is faster, easier, accurate, and can be done in the privacy of your own home, at your convenience.
Sunshine = Vitamin D
Getting a little sun every day, without sunblock, is important to vitamin D production.
Vitamin D - How Much to Take?
The RDA for vitamin D is way too low, but there is some scientific consensus about what's the right dose, depending on how much sunshine you get and where you live.
Vitamin D Nutrient Review
Vitamin D is an essential vitamin and an essential hormone.
Vitamin D Research and References
A select list of references on vitamin D if you want to get up to speed on the science and biochemistry of this important vitamin/hormone.
Vitamin D Testing Science and Biochemistry
For health care professionals and science geeks, here's the science and biochemistry of why it's so important to test properly for vitamin D.
Children and Vitamin D
Infants and toddlers are at risk of vitamin D deficiency if mothers are vitamin D deficient. Nursing mothers in particular need to pay attention to their vitamin D levels.
More Evidence that Vitamin D Protects Against Breast Cancer
A new study shows that women with low vitamin D levels are at a higher risk for breast cancer, but women on HRT aren't as well protected.
Progesterone, Inflammation and Breast Cancer
The authors of a study about progesterone receptors make controversial claims about progesterone, inflammation and breast cancer.
Women and Heart Disease
Dr. John Lee explains the differences in heart disease between women and men, and how hormones and HRT affect women's hearts.



