The Use of Probiotics for Pain Reduction in Patients With Fibromyalgia: A Systematic Review. Principles and Practice of Clinical Research, [S. l.], v. 11, n. 3, 2026. DOI: 10.21801/ppcrj.2025.113.5. Disponível em: https://journal.ppcr.org/index.php/ppcrjournal/article/view/465.. Acesso em: 28 jan. 2026.