Higher vitamin B12 from mid- to late life is related to slower rates of cognitive decline https://pmc.ncbi.nlm.nih.gov/articles/PMC12568389/ Improving B12 status in dementia-free older adults may help mitigate cognitive decline into later life https://www.aponet.de/artikel/vitamin-b12-schuetzt-das-gehirn-und-verzoegert-geistigen-abbau-32606 Efforts to manage vitamin B12 status and improve nutrition throughout the life course may help mitigate cognitive decline into older age, but future studies are needed