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Kazandjieva J, Dimitrova J, Sankeva M, Yankov D, Bocheva V, Kircheva K, Gincheva V, Gospodinova K, Andasorova R, Milanova M, Jeleva D, Zlateva P, Vasileva I, Yankova R, Gotseva S, Dakova T, Zografova E, Marina S, Kateva M, Broshtilova V, Todeva V, Tsankov N, Mitova Z, Boyanova N, Milani M. Efficacy of a retinoid complex plus anti-inflammatory component cream alone or in combination with prebiotic food supplement in adult acne: A randomized, assessor-blinded, parallel-group, multicenter trial on 184 women. J Cosmet Dermatol. 2022 Nov;21(11):5716-5722. doi: 10.1111/jocd.15074. Epub 2022 May 23. PMID: 35545875.
Limitations: Food supplement containing a mixture of prebiotic molecules (FOS&GOS) zinc, lactoferrin, and niacinamide, not just one ingredient
