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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? B12 Injection vs. Oral Supplements: Which One Do You Actually Need? ELLEMES Medical Spa Vitamin B 12 Injections Vs Oral Pills: Expert Insights Regenics Blog Vitamin B12 Injections vs. Supplements: Which Works Best? Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency PMC
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