THE IMPACT OF VITAMIN B12 DEFICIENCY ON LEARNING PERFORMANCE AND NERVOUS SYSTEM FUNCTION IN SCHOOL-AGED CHILDREN. American Journal of Research in Humanities and Social Sciences, [S. l.], v. 46, p. 53–60, 2026. Disponível em: https://americanjournal.org/index.php/ajrhss/article/view/3444. Acesso em: 29 apr. 2026.