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This compression can happen due to swelling and inflammation, injury or pressure
Insert the needle at the angle you were taught (90 degrees for a perpendicular injection or 45 degrees for an angled injection)
Your body is able to absorb between 15% and 97% of the B12 vitamin from the injection without snags or additional hindrances
Those two figures are not interchangeable the 50 mg vials dose is roughly 17 larger so a dose is always drawn against the concentration of the specific vial in front of you, never carried over from one vial size to another
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