{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T15:57:02Z","timestamp":1773417422012,"version":"3.50.1"},"reference-count":57,"publisher":"IMR Press","issue":"2","license":[{"start":{"date-parts":[[2022,3,1]],"date-time":"2022-03-01T00:00:00Z","timestamp":1646092800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["International Journal for Vitamin and Nutrition Research"],"published-print":{"date-parts":[[2022,3]]},"abstract":"<jats:p> Abstract. Background: Vitamin D insufficiency is common before and after bariatric surgery. Optimal supplementation to treat vitamin D insufficiency is not clearly defined. Objective: Determine if serum 25 (OH) D levels improve by the consumption of an additional monthly ergocalciferol supplement by subjects after bariatric surgery. Study design: Thirty-two subjects were randomly divided to receive an additional 100,000 IUs of ergocalciferol monthly after bariatric surgery (n=10) or standard level vitamin D supplement after bariatric surgery (n=22). Serum 25 (OH) D, calcium, and hemoglobin A1c levels were measured preoperatively and one year after bariatric surgery. Results: Mean changes in BMI at 1-year post-operation was \u221218.12\u00b16.46 kg\/m<jats:sup>2<\/jats:sup> in the control group versus \u221218.84\u00b14.7 kg\/m<jats:sup>2<\/jats:sup>; p=0.638 in the vitamin D group. One year after bariatric surgery, the mean changes from baseline in vitamin D levels were 2.69\u00b19.4 and 12.4\u00b117.0 ng\/mL in control and intervention groups, respectively. The treated group showed a marginally higher mean increase in Vitamin D than the control group, p=0.059. Other mean changes at 1-year post-surgery that were not significantly different include calcium \u22120.264\u00b10.45 and \u22120.21\u00b10.509 mg\/dl in control and intervention groups, respectively and HbA<jats:sub>1c<\/jats:sub> \u22121.0\u00b11.21 and \u22120.95\u00b10.071% in control and intervention groups, respectively. Conclusion: This study showed 100,000 IUs ergocalciferol once a month is a safe and effective treatment for vitamin D insufficiency in most patients having bariatric surgery. <\/jats:p>","DOI":"10.1024\/0300-9831\/a000728","type":"journal-article","created":{"date-parts":[[2021,9,15]],"date-time":"2021-09-15T06:34:45Z","timestamp":1631687685000},"page":"109-117","source":"Crossref","is-referenced-by-count":13,"title":["Improving vitamin D status in bariatric surgery subjects with monthly high-dose ergocalciferol"],"prefix":"10.31083","volume":"92","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9757-0039","authenticated-orcid":true,"given":"Shannon","family":"Galyean","sequence":"first","affiliation":[{"name":"Department of Nutritional Sciences, Texas Tech University, Lubbock, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Syn","sequence":"additional","affiliation":[{"name":"Department of Surgery Advanced Bariatric Surgery Center, Lubbock, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hadil S","family":"Subih","sequence":"additional","affiliation":[{"name":"Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mallory","family":"Boylan","sequence":"additional","affiliation":[{"name":"Department of Nutritional Sciences, Texas Tech University, Lubbock, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"16242","reference":[{"key":"c1","unstructured":"National Institutes of Health (Office of Dietary Supplements). 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