where do they inject b12 Best Vitamin Injection Site: Administering B12 Shots B12 Injection Dosage and Frequency:

Research that analysed 303 men with infertility found a significant positive monotonic relationship between serum vitamin B12 and total testosterone ( = 0.19, P = 0.001) [16]

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Persistently high results could signal a blood disorder, a malignancy or a problem with the liver or kidneys

Once a patient is on a maintenance dose, their B12 levels are generally stable, and a single days difference is unlikely to have a clinical impact

B12 is water-soluble, so your body uses what it needs and passes much of the extra through your urine