Which oral vitamin B12 (B12) supplement is best absorbed in the gut? What is the best B12 shot for someone with a C677T gene mutation who has reacted poorly to methyl B12 and oral supplements? Should I give vitamin B12 injection or oral to my 4 year old boy? B12 Injections vs Pills Baltimore: Which Works?
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oral vs injectable b12 Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency • The Blood Project