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administering b12 injection How to Give Yourself a Choosing the Right Needle and –

B12 shots bypass the digestive system, ensuring immediate absorption and delivering the vitamin directly to the bloodstream

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R 2 , R 3 , R 4 , and R 5 are independently selected from the group consisting of: H, C1-4 alkyl, halogen-substituted C 1-4 alkyl, NR 9 R 10 , and CN