Is serum folate levels the level o Pernicious Anaemi The New Vitamin B12 Deficiency Test Vitamin B12 Deficiency: Recognition and Management AFP Cobalamin (vitamin B12) and Folate Deficiency Province of British Columbia Full article: The vitamin B12 absorption test, CobaSorb, identifies patients not requiring vitamin B12 injection therapy If you have been on Metformin for several years, monitoring is essential. The B12 Link: Long term use (typically 4+ years) can interfere with Vitamin B12 absorption. Symptoms to Watch: Fatigue, memory issues,