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Low levels of vitamin D in the population as a whole suggest that most people need to take a vitamin D supplement. This may be especially true for seniors, as the ability to synthesize vitamin D in the skin declines with age.

Andrew Weil
Senior, People, Age
"New Recommendation: Why You Need More Vitamin D" by Dr. Andrew Weil, www.huffingtonpost.com. April 9, 2010.
Low levels of vitamin D in the population as a whole suggest that most people need to take a vitamin D supplement. This may be especially true for seniors, as the ability to synthesize vitamin D in the skin declines