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In such cases, Vitamin B12 shots offer a direct and efficient method of supplementation
Most absorption problems aren't treatable but a few are - notably h pylori infection - which would mean that once that has been dealt with you would be able to absorb B12 from your diet so wouldn't need maintenance shots for life
This results in B12 malabsorption, deficiency, and megaloblastic (abnormally large and dysfunctional) RBCs in many cases
A January 2026 FDA warning letter also named 5-Amino-1MQ
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