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Most S. Calif lifeguards have good level of vitamin D (above 40 ng) - Aug 2016

From Aug 18 email
GrassrootsHealth tested the vitamin D serum levels of a group of Southern California Beach Lifeguards at the end of summer. As shown in the chart below, the majority of the lifeguards (69%) had 25(OH)D concentrations ≥40 ng/ml. All of the lifeguards reported not taking any vitamin D supplements.
California Lifeguards above 40 nanograms VDW # 7744

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Evolution seems to indicate a vitamin D level of 45-60 ng

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Most S. Calif lifeguards have good level of vitamin D (above 40 ng) - Aug 2016

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- Each hour of outdoor work in India increased vitamin D levels by 2 nanograms – March 2017 High levels of Vitamin D and low rates of skin cancer among commercial fishermen – July 2019 Farmers in India have 2.5 times higher vitamin D than office workers – 2016

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