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What is the best B12 shot for someone with a C677T gene mutation who has reacted poorly to methyl B12 and oral supplements? Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Vitamin B12 injections for MTHFR: Injection or sublingual B12? Methyl Life Supplements Methyl B12 vs B12 Core Med Science Surgo Surgical Supply Newmarket
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