Vitamin D: Is 50ng enough for optimum health? Most are deficient <30ng

Most Americans deficient (under 30 ng) or severely deficient (under 20 ng), especially blacks:

42 % of US adults less than 20 ng of vitamin D and 82 % of blacks – Jan 2011

Excerpt from Is 50 ng of vitamin D too high, just right, or not enough

At VitaminDWiki – 50 – 60 ng

At VitaminDWiki – need > 60 ng

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