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    • Deprecated function: Return type of DatabaseStatementBase::execute($args = [], $options = []) should either be compatible with PDOStatement::execute(?array $params = null): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2246 of /var/www/webmd/apps/mdedge/htdocs/includes/database/database.inc).
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    • Deprecated function: Return type of DatabaseStatementEmpty::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2348 of /var/www/webmd/apps/mdedge/htdocs/includes/database/database.inc).

    William B. Grant, PhD

    Article

    25-hydroxyvitamin D concentration is key to analyzing vitamin D’s effects

    Author:
    William B. Grant, PhD

    There are significant benefits of vitamin D supplementation to achieve a 25(OH)D concentration of 30 to 60 ng/mL for important health outcomes.

    • Read More

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    • MDedge Home
    • Cardiology
    • Clinician Reviews
    • Dermatology
    • Emergency Medicine
    • Endocrinology/Diabetes
    • Family Medicine
    • Federal Practitioner
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    • Internal Medicine
    • Neurology
    • Obstetrics And Gynecology
    • Pediatrics
    • Psychiatry
    • Pulmonology
    • Rheumatology
    • Surgery