 Supplemental vitamin D The HANDLS dietary supplement questionnaire was adapted from the 2007 NHANES instrument.39 HANDLS participants provided supplement bottles during their dietary interview at the follow-up visit only i.e. visit 2. Information on Over-The-Counter OTC vitamin and mineral supplements, antacids, prescription supplements, and botanicals were reported, and supplement users were asked about dose strength, dose amount consumed, length of supplement use converted to days, frequency of use daily, monthly, seasonally, annually, and if each supplement was taken the day prior to interview. 