Testing is Necessary for Diagnosis and Treatment of Vitamin D Deficiency

Vitamin D experts advise that testing for serum vitamin D levels is the only way to correctly diagnose and properly treat vitamin D insufficiencies...Read more from USANA Essentials of Health.

USANA is offering a free vitamin D blood test for Associates, PCs, and guests in the U.S. who would like to participate in a study assessing vitamin D status. For more information, please visit www.usanavitamindsurvey.com.

If you are not yet a USANA Associate or Preferred Customer please contact us for more information.

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