Why the optimal requirement for Vitamin D3 is probably much higher than what is officially recommended for adults CLICK HERE TO DOWNLOAD THE PDF Publication Date: November 2005 / Author: Reinhold Vieth / Categories: Journal Articles / Vieth Research / Vitamin D / 2018-01-17T17:05:05-05:00 Share This Document, Choose Your Platform: FacebookXRedditLinkedInTumblrPinterestVkEmail