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, Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project The New Vitamin B12 Deficiency Test Full article: The vitamin B12 absorption test, CobaSorb, identifies patients not requiring vitamin B12 injection therapy
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when to check b12 level after injection B-12 (Methylcobalamin) Therapy