correct needle size for b12 injection a Injection: A Simple Guide what size needle do i

Minors must travel with an identity document

The syringe is inserted into the glass container and filled to the desired amount for proper dosing

Nothing here constitutes medical advice, dosing guidance or a recommendation for human or veterinary use

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This could be because they huffed a lot at the time, or they might have other health conditions (like anemia) or a pre-existing vitamin B12 deficiency