Quotation by

Andrew Weil

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

Age

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Many people do not have enough vitamin D, so taking supplements can help improve their levels. Older adults might need supplements even more because their skin produces less vitamin D as they get older.

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