June 2020 in “International journal of research in dermatology” This study found that oral intake of choline-stabilized orthosilicic acid (ch-OSA®) significantly improved hair, skin, and nail health in the Indian population, with no reported side effects.
50 citations
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October 2007 in “Archives of Dermatological Research” 
March 2014 in “CRC Press eBooks” Some nutrients and antioxidants may improve skin and hair health, but more research is needed to confirm these benefits.
1 citations
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January 2010 in “Springer eBooks” Certain micronutrients may improve hair and nail health, but more research is needed to confirm their benefits.
45 citations
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June 2016 in “Anais brasileiros de dermatologia/Anais Brasileiros de Dermatologia” This review evaluates the scientific literature on silicon supplements, noting that orthosilicic acid shows higher bioavailability, but emphasizes the need for further clinical studies on safety and efficacy.