Indoor Tanning and Vitamin D Status
Vitamin D Status by Indoor Tanning Use for Non-Supplement Takers Chart showing vitamin D status by use of indoor tanning in prior 6 months for non-supplement takers. Format: PDF Dimensions: 8.5 x 11 inches...
Tanning as a Source of Vitamin D
Two different research groups conclude the US RDA is off by an order of magnitude GrassrootsHealth scientists and staff have published a research letter, citing the D*action data, calling for the Institute of Medicine...
Vitamin D Levels of Indoor Tanners
Sunlight and supplements are well known sources of vitamin D, but other sources of UV light, such as indoor tanning, can also effectively raise vitamin D levels. In addition to sun exposure habits, we...
What if you don’t take vitamin D supplements?
In our last post, we revisited the topic of vitamin D in our food. For most people, what we eat simply does not provide us with the amount of vitamin D our bodies need....
Can you achieve an optimal vitamin D level with the sun?
The GrassrootsHealth panel of expert scientists’ recommended range of vitamin D levels for general health is 40-60 ng/ml (100-150 nmol/L). This is based on overwhelming evidence about the association between vitamin D and many...
Science Speaks: What causes a low vitamin D response?
On occasion we have participants who experience a lower than expected vitamin D level. In this blog we will explore possible causes of a low or slow to rise vitamin D response. 1. UVB...
Finding the right dose of vitamin D
Science Speaks: How much vitamin D do I need? We often receive questions about how much supplemental vitamin D someone should take. The key indicator of vitamin D status is the nutrient level in...
Vitamin D Non-Food Sources
Quantifying the Non-Food Sources of Basal Vitamin D Input Sharon L. McDonnell, Christine B. French, Robert P. Heaney Unsupplemented vitamin D status is determined by cutaneous synthesis and food inputs; however, their relative magnitudes...