Best B12 Shots in Chicago & Naperville 2026 Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project B12 Folate normal ranges in blood work can be between 220 and 1200. I personally think anything under 600 is too low. B12 injections are the best (by pass digestion) and you can PDF] Sublingual vitamin B12 compared to intramuscular injection in patients with type 2 diabetes treated with metformin: a randomised trial. Semantic Scholar
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