VDC test kit slider

Where is our vitamin D coming from: Part 2

Posted on: April 5, 2013   by  John Cannell, MD


As we know from the previous blog, Professor Robert Heaney found that 1,600 IU of vitamin D/day input source is missing from modern man. What I mean by that, is somehow 25(OH)D levels of modern man reflect that humans are getting an extra 1600 IU of vitamin D that is not coming from sun exposure or the cholecalciferol in food. The question has arose, might there be 25(OH)D in meat that accounts for the equivalent of 1600 IU of vitamin D?

You are unauthorized to view this page.

1 Response to Where is our vitamin D coming from: Part 2

  1. [email protected]

    WHat about 254 nM UVc from fluorescent lights? In spite of having a thin glass envelope, how much escapes from the ends of the bulbs where there may be less phosphor? From the active region of the bulb?

Test Your Vitamin D Levels at Home!

Our in-home vitamin D test kit is easy, affordable, and an accurate way to find out your Vitamin D status.

order NOW

We need your help!

We're spreading awareness on Vitamin D Deficiency
Donate NOW
Latest Articles
What is the relationship between vitamin D and childhood UTIs?

A new study suggests vitamin D may protect against UTIs among children by upregulating their own naturally occurring antimicrobial peptides.

Weekly Newsletter

Our Sponsors

December 21st is DDAY. Click here to celebrate the day with us!