Cosmeceuticals: A Review of Clinical Studies Claiming to Contain Specific, Well-Characterized Strains of Probiotics or Postbiotics oleh Ioannis M. Theodorou, Dorothea Kapoukranidou, Markos Theodorou, Joulia K. Tsetis, Alexandra Eleftheria Menni, Georgios Tzikos, Stella Bareka, Anne Shrewsbury, George Stavrou, Katerina Kotzampassi