<b><i>Background:</i></b> Vitamin D deficiency is frequently associated with several medical conditions. However, a comprehensive meta-analysis assessing the association between vitamin D level and acne is lacking. <b><i>Objective:</i></b> To determine the relationship between vitamin D level and acne, and to assess the association between vitamin D level and acne severity. <b><i>Methods:</i></b> This meta-analysis was assessed by using the PubMed, EMBASE, Cochrane, and Scopus databases following the PRISMA guidelines. Serum/plasma 25-hydroxyvitamin D (25[OH]D) level, vitamin D deficiency, and the severity association between acne patients and healthy controls (HCs) were evaluated. The quality assessment was performed by using the Newcastle-Ottawa Scale. <b><i>Results:</i></b> Thirteen articles with a total of 1,362 acne patients and 1,081 HCs were included. The circulating 25(OH)D levels were significantly lower in patients with acne than in HCs (pooled MD = –9.02 ng/mL, 95% CI = –13.22 to –4.81, <i>p</i> < 0.0001). Vitamin D deficiency was more prevalent in acne patients than in HCs (pooled OR = 2.97, 95% CI = 1.68–5.23, <i>I</i><sup>2</sup> = 72%). Also, vitamin D levels were negatively correlated with acne severity. <b><i>Conclusion:</i></b> This meta-analysis demonstrated the significantly low vitamin D levels in acne patients. Also, there was evidence of an inverse association between vitamin D levels and acne severity. Therefore, vitamin D might be involved in the pathogenesis of acne.
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